Update dependency pytest-django to v4

poetry.lock

@@ -1056,15 +1056,15 @@ category = "dev"
 description = "A Django plugin for pytest."
 name = "pytest-django"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "3.10.0"
+python-versions = ">=3.5"
+version = "4.0.0"
 
 [package.dependencies]
-pytest = ">=3.6"
+pytest = ">=5.4.0"
 
 [package.extras]
 docs = ["sphinx", "sphinx-rtd-theme"]
-testing = ["django", "django-configurations (>=2.0)", "six"]
+testing = ["django", "django-configurations (>=2.0)"]
 
 [[package]]
 category = "dev"
@@ -1622,8 +1622,7 @@ ldap = ["django-auth-ldap"]
 social = ["social-auth-app-django"]
 
 [metadata]
-content-hash = "82261204e7cf6c4dc08a0870cf550763186d5bfe22dc212973a0893941df3a9d"
-lock-version = "1.0"
+content-hash = "d98e729970b91965b0c0df76cd4467288df7f76205a8d16d46bea319182eaa97"
 python-versions = "^3.6"
 
 [metadata.files]
@@ -2244,8 +2243,8 @@ pytest-cov = [
     {file = "pytest_cov-2.10.1-py2.py3-none-any.whl", hash = "sha256:45ec2d5182f89a81fc3eb29e3d1ed3113b9e9a873bcddb2a71faaab066110191"},
 ]
 pytest-django = [
-    {file = "pytest-django-3.10.0.tar.gz", hash = "sha256:4de6dbd077ed8606616958f77655fed0d5e3ee45159475671c7fa67596c6dba6"},
-    {file = "pytest_django-3.10.0-py2.py3-none-any.whl", hash = "sha256:c33e3d3da14d8409b125d825d4e74da17bb252191bf6fc3da6856e27a8b73ea4"},
+    {file = "pytest-django-4.0.0.tar.gz", hash = "sha256:5f964ccda1f551e00589ab0679a7c45c36c509a44b5bfb5ad07954e0ae3f4bed"},
+    {file = "pytest_django-4.0.0-py2.py3-none-any.whl", hash = "sha256:0e91003fdd41ac0322c1978682be2ca180bc564203dd53c698f99242bf513614"},
 ]
 pytest-sugar = [
     {file = "pytest-sugar-0.9.4.tar.gz", hash = "sha256:b1b2186b0a72aada6859bea2a5764145e3aaa2c1cfbb23c3a19b5f7b697563d3"},

pyproject.toml

@@ -49,7 +49,7 @@ flake8-rst-docstrings = "^0.0.14"
 safety = "^1.9.0"
 sphinx = "^3.0.4"
 sphinx-autodoc-typehints = "^1.10.3"
-pytest-django = "^3.9.0"
+pytest-django = "^4.0.0"
 sphinx_rtd_theme = "^0.5.0"
 
 [tool.black]