Update dependency pytest to v6

This MR contains the following updates:

Package	Type	Update	Change
pytest	dev-dependencies	major	^5.3 -> ^6.0

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poetry.lock

@@ -722,10 +722,6 @@ version = "3.0.1"
 Django = ">=1.11.3"
 babel = "*"
 
-[package.dependencies.phonenumbers]
-optional = true
-version = ">=7.0.2"
-
 [package.extras]
 phonenumbers = ["phonenumbers (>=7.0.2)"]
 phonenumberslite = ["phonenumberslite (>=7.0.2)"]
@@ -1195,6 +1191,14 @@ zipp = ">=0.5"
 docs = ["sphinx", "rst.linker"]
 testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
 
+[[package]]
+category = "dev"
+description = "iniconfig: brain-dead simple config-ini parsing"
+name = "iniconfig"
+optional = false
+python-versions = "*"
+version = "1.0.1"
+
 [[package]]
 category = "dev"
 description = "A Python utility / library to sort Python imports."
@@ -1518,24 +1522,25 @@ description = "pytest: simple powerful testing with Python"
 name = "pytest"
 optional = false
 python-versions = ">=3.5"
-version = "5.4.3"
+version = "6.0.1"
 
 [package.dependencies]
 atomicwrites = ">=1.0"
 attrs = ">=17.4.0"
 colorama = "*"
+iniconfig = "*"
 more-itertools = ">=4.0.0"
 packaging = "*"
 pluggy = ">=0.12,<1.0"
-py = ">=1.5.0"
-wcwidth = "*"
+py = ">=1.8.2"
+toml = "*"
 
 [package.dependencies.importlib-metadata]
 python = "<3.8"
 version = ">=0.12"
 
 [package.extras]
-checkqa-mypy = ["mypy (v0.761)"]
+checkqa_mypy = ["mypy (0.780)"]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
 [[package]]
@@ -2105,14 +2110,6 @@ optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "1.3.0"
 
-[[package]]
-category = "dev"
-description = "Measures the displayed width of unicode strings in a terminal"
-name = "wcwidth"
-optional = false
-python-versions = "*"
-version = "0.2.5"
-
 [[package]]
 category = "main"
 description = "Character encoding aliases for legacy web content"
@@ -2151,7 +2148,7 @@ celery = ["Celery", "django-celery-results", "django-celery-beat", "django-celer
 ldap = ["django-auth-ldap"]
 
 [metadata]
-content-hash = "76019828f263a5848b086293108ffe885208cfc930cf13d63abcb643166bc270"
+content-hash = "6d927e923cdf2dcf22a03238598984f550d966edd81cd9bcbd8fd019a00eccfe"
 python-versions = "^3.7"
 
 [metadata.files]
@@ -2559,6 +2556,10 @@ importlib-metadata = [
     {file = "importlib_metadata-1.7.0-py2.py3-none-any.whl", hash = "sha256:dc15b2969b4ce36305c51eebe62d418ac7791e9a157911d58bfb1f9ccd8e2070"},
     {file = "importlib_metadata-1.7.0.tar.gz", hash = "sha256:90bb658cdbbf6d1735b6341ce708fc7024a3e14e99ffdc5783edea9f9b077f83"},
 ]
+iniconfig = [
+    {file = "iniconfig-1.0.1-py3-none-any.whl", hash = "sha256:80cf40c597eb564e86346103f609d74efce0f6b4d4f30ec8ce9e2c26411ba437"},
+    {file = "iniconfig-1.0.1.tar.gz", hash = "sha256:e5f92f89355a67de0595932a6c6c02ab4afddc6fcdc0bfc5becd0d60884d3f69"},
+]
 isort = [
     {file = "isort-5.4.1-py3-none-any.whl", hash = "sha256:819fa99f2a9323025ade768e94b2e27447cd9b0a64595a90f21595e11151b788"},
     {file = "isort-5.4.1.tar.gz", hash = "sha256:a4fb5fffc46494cda15e33a996c8e724f8e3db19682b84cc7c990b57f2941e9f"},
@@ -2701,6 +2702,8 @@ pillow = [
     {file = "Pillow-7.2.0-cp38-cp38-manylinux2014_aarch64.whl", hash = "sha256:5e51ee2b8114def244384eda1c82b10e307ad9778dac5c83fb0943775a653cd8"},
     {file = "Pillow-7.2.0-cp38-cp38-win32.whl", hash = "sha256:725aa6cfc66ce2857d585f06e9519a1cc0ef6d13f186ff3447ab6dff0a09bc7f"},
     {file = "Pillow-7.2.0-cp38-cp38-win_amd64.whl", hash = "sha256:a060cf8aa332052df2158e5a119303965be92c3da6f2d93b6878f0ebca80b2f6"},
+    {file = "Pillow-7.2.0-pp36-pypy36_pp73-macosx_10_10_x86_64.whl", hash = "sha256:9c87ef410a58dd54b92424ffd7e28fd2ec65d2f7fc02b76f5e9b2067e355ebf6"},
+    {file = "Pillow-7.2.0-pp36-pypy36_pp73-manylinux2010_x86_64.whl", hash = "sha256:e901964262a56d9ea3c2693df68bc9860b8bdda2b04768821e4c44ae797de117"},
     {file = "Pillow-7.2.0-pp36-pypy36_pp73-win32.whl", hash = "sha256:25930fadde8019f374400f7986e8404c8b781ce519da27792cbe46eabec00c4d"},
     {file = "Pillow-7.2.0.tar.gz", hash = "sha256:97f9e7953a77d5a70f49b9a48da7776dc51e9b738151b22dacf101641594a626"},
 ]
@@ -2827,8 +2830,8 @@ pyparsing = [
     {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
 ]
 pytest = [
-    {file = "pytest-5.4.3-py3-none-any.whl", hash = "sha256:5c0db86b698e8f170ba4582a492248919255fcd4c79b1ee64ace34301fb589a1"},
-    {file = "pytest-5.4.3.tar.gz", hash = "sha256:7979331bfcba207414f5e1263b5a0f8f521d0f457318836a7355531ed1a4c7d8"},
+    {file = "pytest-6.0.1-py3-none-any.whl", hash = "sha256:8b6007800c53fdacd5a5c192203f4e531eb2a1540ad9c752e052ec0f7143dbad"},
+    {file = "pytest-6.0.1.tar.gz", hash = "sha256:85228d75db9f45e06e57ef9bf4429267f81ac7c0d742cc9ed63d09886a9fe6f4"},
 ]
 pytest-cov = [
     {file = "pytest-cov-2.10.0.tar.gz", hash = "sha256:1a629dc9f48e53512fcbfda6b07de490c374b0c83c55ff7a1720b3fccff0ac87"},
@@ -2910,6 +2913,7 @@ regex = [
     {file = "regex-2020.7.14-cp38-cp38-manylinux1_i686.whl", hash = "sha256:5ea81ea3dbd6767873c611687141ec7b06ed8bab43f68fad5b7be184a920dc99"},
     {file = "regex-2020.7.14-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:bbb332d45b32df41200380fff14712cb6093b61bd142272a10b16778c418e98e"},
     {file = "regex-2020.7.14-cp38-cp38-manylinux2010_i686.whl", hash = "sha256:c11d6033115dc4887c456565303f540c44197f4fc1a2bfb192224a301534888e"},
+    {file = "regex-2020.7.14-cp38-cp38-manylinux2010_x86_64.whl", hash = "sha256:75aaa27aa521a182824d89e5ab0a1d16ca207318a6b65042b046053cfc8ed07a"},
     {file = "regex-2020.7.14-cp38-cp38-win32.whl", hash = "sha256:d6cff2276e502b86a25fd10c2a96973fdb45c7a977dca2138d661417f3728341"},
     {file = "regex-2020.7.14-cp38-cp38-win_amd64.whl", hash = "sha256:7a2dd66d2d4df34fa82c9dc85657c5e019b87932019947faece7983f2089a840"},
     {file = "regex-2020.7.14.tar.gz", hash = "sha256:3a3af27a8d23143c49a3420efe5b3f8cf1a48c6fc8bc6856b03f638abc1833bb"},
@@ -3066,10 +3070,6 @@ vine = [
     {file = "vine-1.3.0-py2.py3-none-any.whl", hash = "sha256:ea4947cc56d1fd6f2095c8d543ee25dad966f78692528e68b4fada11ba3f98af"},
     {file = "vine-1.3.0.tar.gz", hash = "sha256:133ee6d7a9016f177ddeaf191c1f58421a1dcc6ee9a42c58b34bed40e1d2cd87"},
 ]
-wcwidth = [
-    {file = "wcwidth-0.2.5-py2.py3-none-any.whl", hash = "sha256:beb4802a9cebb9144e99086eff703a642a13d6a0052920003a230f3294bbe784"},
-    {file = "wcwidth-0.2.5.tar.gz", hash = "sha256:c4d647b99872929fdb7bdcaa4fbe7f01413ed3d98077df798530e5b04f116c83"},
-]
 webencodings = [
     {file = "webencodings-0.5.1-py2.py3-none-any.whl", hash = "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78"},
     {file = "webencodings-0.5.1.tar.gz", hash = "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"},