Update dependency django-maintenance-mode to ^0.15.0

This MR contains the following updates:

Package	Type	Update	Change
django-maintenance-mode	dependencies	minor	^0.14.0 -> ^0.15.0

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poetry.lock

@@ -652,7 +652,7 @@ description = "django-maintenance-mode shows a 503 error page when maintenance-m
 name = "django-maintenance-mode"
 optional = false
 python-versions = "*"
-version = "0.14.0"
+version = "0.15.0"
 
 [[package]]
 category = "main"
@@ -722,6 +722,10 @@ 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)"]
@@ -1205,7 +1209,7 @@ description = "A Python utility / library to sort Python imports."
 name = "isort"
 optional = false
 python-versions = ">=3.6,<4.0"
-version = "5.5.1"
+version = "5.5.2"
 
 [package.extras]
 colors = ["colorama (>=0.4.3,<0.5.0)"]
@@ -1493,7 +1497,7 @@ description = "Pygments is a syntax highlighting package written in Python."
 name = "pygments"
 optional = false
 python-versions = ">=3.5"
-version = "2.6.1"
+version = "2.7.0"
 
 [[package]]
 category = "main"
@@ -1522,7 +1526,7 @@ description = "pytest: simple powerful testing with Python"
 name = "pytest"
 optional = false
 python-versions = ">=3.5"
-version = "6.0.1"
+version = "6.0.2"
 
 [package.dependencies]
 atomicwrites = ">=1.0"
@@ -1973,7 +1977,7 @@ description = "Manage dynamic plugins for Python applications"
 name = "stevedore"
 optional = false
 python-versions = ">=3.6"
-version = "3.2.1"
+version = "3.2.2"
 
 [package.dependencies]
 pbr = ">=2.0.0,<2.1.0 || >2.1.0"
@@ -2147,7 +2151,7 @@ celery = ["Celery", "django-celery-results", "django-celery-beat", "django-celer
 ldap = ["django-auth-ldap"]
 
 [metadata]
-content-hash = "c0631e45178a4739db4cf5dac86b52ff18789dc07ffcfaf1f5af4c557140aeba"
+content-hash = "cda56c7b2512ac3d8cb79e409c04e0aa130a55d5ce0191428964dad255458731"
 lock-version = "1.0"
 python-versions = "^3.7"
 
@@ -2396,8 +2400,8 @@ django-jsonstore = [
     {file = "django-jsonstore-0.4.1.tar.gz", hash = "sha256:d6e42152af3f924e4657c99e80144ba9a6410799256f6134b5a4e9fa4282ec10"},
 ]
 django-maintenance-mode = [
-    {file = "django-maintenance-mode-0.14.0.tar.gz", hash = "sha256:f3fef1760fdcda5e0bf6c2966aadc77eea6f328580a9c751920daba927281a68"},
-    {file = "django_maintenance_mode-0.14.0-py2-none-any.whl", hash = "sha256:b4cc24a469ed10897826a28f05d64e6166a58d130e4940ac124ce198cd4cc778"},
+    {file = "django-maintenance-mode-0.15.0.tar.gz", hash = "sha256:f8c500b077045db5444d4d4eb613fd1085b51f960d6d61b13b1cce461e1d0102"},
+    {file = "django_maintenance_mode-0.15.0-py3-none-any.whl", hash = "sha256:54b5afe3282d450bc4161461c5d518b8097cbb29a5fdd0baf1b8c3a1e5f90c08"},
 ]
 django-material = [
     {file = "django-material-1.7.0.tar.gz", hash = "sha256:8d8e76605aa77de3d37d8ae4db1835479e484f1530485fd6b66535244f64131b"},
@@ -2561,8 +2565,8 @@ iniconfig = [
     {file = "iniconfig-1.0.1.tar.gz", hash = "sha256:e5f92f89355a67de0595932a6c6c02ab4afddc6fcdc0bfc5becd0d60884d3f69"},
 ]
 isort = [
-    {file = "isort-5.5.1-py3-none-any.whl", hash = "sha256:a200d47b7ee8b7f7d0a9646650160c4a51b6a91a9413fd31b1da2c4de789f5d3"},
-    {file = "isort-5.5.1.tar.gz", hash = "sha256:92533892058de0306e51c88f22ece002a209dc8e80288aa3cec6d443060d584f"},
+    {file = "isort-5.5.2-py3-none-any.whl", hash = "sha256:ba91218eee31f1e300ecc079ef0c524cea3fc41bfbb979cbdf5fd3a889e3cfed"},
+    {file = "isort-5.5.2.tar.gz", hash = "sha256:171c5f365791073426b5ed3a156c2081a47f88c329161fd28228ff2da4c97ddb"},
 ]
 jinja2 = [
     {file = "Jinja2-2.11.2-py2.py3-none-any.whl", hash = "sha256:f0a4641d3cf955324a89c04f3d94663aa4d638abe8f733ecd3582848e1c37035"},
@@ -2816,8 +2820,8 @@ pyflakes = [
     {file = "pyflakes-2.2.0.tar.gz", hash = "sha256:35b2d75ee967ea93b55750aa9edbbf72813e06a66ba54438df2cfac9e3c27fc8"},
 ]
 pygments = [
-    {file = "Pygments-2.6.1-py3-none-any.whl", hash = "sha256:ff7a40b4860b727ab48fad6360eb351cc1b33cbf9b15a0f689ca5353e9463324"},
-    {file = "Pygments-2.6.1.tar.gz", hash = "sha256:647344a061c249a3b74e230c739f434d7ea4d8b1d5f3721bc0f3558049b38f44"},
+    {file = "Pygments-2.7.0-py3-none-any.whl", hash = "sha256:2df50d16b45b977217e02cba6c8422aaddb859f3d0570a88e09b00eafae89c6e"},
+    {file = "Pygments-2.7.0.tar.gz", hash = "sha256:2594e8fdb06fef91552f86f4fd3a244d148ab24b66042036e64f29a291515048"},
 ]
 pyjwt = [
     {file = "PyJWT-1.7.1-py2.py3-none-any.whl", hash = "sha256:5c6eca3c2940464d106b99ba83b00c6add741c9becaec087fb7ccdefea71350e"},
@@ -2828,8 +2832,8 @@ pyparsing = [
     {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
 ]
 pytest = [
-    {file = "pytest-6.0.1-py3-none-any.whl", hash = "sha256:8b6007800c53fdacd5a5c192203f4e531eb2a1540ad9c752e052ec0f7143dbad"},
-    {file = "pytest-6.0.1.tar.gz", hash = "sha256:85228d75db9f45e06e57ef9bf4429267f81ac7c0d742cc9ed63d09886a9fe6f4"},
+    {file = "pytest-6.0.2-py3-none-any.whl", hash = "sha256:0e37f61339c4578776e090c3b8f6b16ce4db333889d65d0efb305243ec544b40"},
+    {file = "pytest-6.0.2.tar.gz", hash = "sha256:c8f57c2a30983f469bf03e68cdfa74dc474ce56b8f280ddcb080dfd91df01043"},
 ]
 pytest-cov = [
     {file = "pytest-cov-2.10.1.tar.gz", hash = "sha256:47bd0ce14056fdd79f93e1713f88fad7bdcc583dcd7783da86ef2f085a0bb88e"},
@@ -2999,8 +3003,8 @@ sqlparse = [
     {file = "sqlparse-0.3.1.tar.gz", hash = "sha256:e162203737712307dfe78860cc56c8da8a852ab2ee33750e33aeadf38d12c548"},
 ]
 stevedore = [
-    {file = "stevedore-3.2.1-py3-none-any.whl", hash = "sha256:ddc09a744dc224c84ec8e8efcb70595042d21c97c76df60daee64c9ad53bc7ee"},
-    {file = "stevedore-3.2.1.tar.gz", hash = "sha256:a34086819e2c7a7f86d5635363632829dab8014e5fd7be2454c7cba84ac7514e"},
+    {file = "stevedore-3.2.2-py3-none-any.whl", hash = "sha256:5e1ab03eaae06ef6ce23859402de785f08d97780ed774948ef16c4652c41bc62"},
+    {file = "stevedore-3.2.2.tar.gz", hash = "sha256:f845868b3a3a77a2489d226568abe7328b5c2d4f6a011cc759dfa99144a521f0"},
 ]
 termcolor = [
     {file = "termcolor-1.1.0.tar.gz", hash = "sha256:1d6d69ce66211143803fbc56652b41d73b4a400a2891d7bf7a1cdf4c02de613b"},