test(api): lint code using pylint

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2203>

api/pyproject.toml

@@ -25,7 +25,7 @@ exclude = ["tests"]
 funkwhale-manage = 'funkwhale_api.main:main'
 
 [tool.poetry.dependencies]
-python = "^3.7"
+python = "^3.7.2"
 
 # Django
 dj-rest-auth = { extras = ["with_social"], version = "2.2.7" }
@@ -115,16 +115,17 @@ pytest-randomly = "==3.12.0"
 pytest-sugar = "==0.9.6"
 requests-mock = "==1.10.0"
 
+[tool.poetry.group.dev.dependencies]
+pylint = "==2.15.6"
+pylint-django = "==2.5.3"
+
 [build-system]
 requires = ["poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"
 
 [tool.pylint.master]
-load-plugins = [
-  "pylint_common",
-  "pylint_django",
-  "pylint_celery",
-]
+load-plugins = ["pylint_django"]
+django-settings-module = "config.settings.testing"
 
 [tool.pylint.messages_control]
 disable = [