chore: remove flake8 block in setup file

setup.cfg

@@ -78,15 +78,3 @@ tag_build = dev1
 
 [aliases]
 test=pytest
-
-[flake8]
-max-complexity = 15
-exclude = .ecosystem,.eggs,.git,.tox,.venv,build,dist,docs,examples,falcon/bench/nuts
-extend-ignore = F403,W504,E203,I202
-max-line-length = 88
-import-order-style = google
-application-import-names = falcon,examples
-builtins = ignore,attr,defined
-per-file-ignores =
-    **/__init__.py:F401,E402
-    falcon/uri.py:F401

tests/test_validators.py

@@ -1,9 +1,9 @@
 import typing  # NOQA: F401
 
 try:
-    import jsonschema as _jsonschema  # NOQA
+    import jsonschema
 except ImportError:
-    pass
+    jsonschema = None  # NOQA
 import pytest
 
 import falcon
@@ -13,12 +13,6 @@
 from _util import create_app, disable_asgi_non_coroutine_wrapping  # NOQA
 
 
-# NOTE(kgriffs): Default to None if missing. We do it like this, here, instead
-#   of in the body of the except statement, above, to avoid flake8 import
-#   ordering errors.
-jsonschema = globals().get('_jsonschema')
-
-
 _VALID_MEDIA = {'message': 'something'}
 _INVALID_MEDIA = {}  # type: typing.Dict[str, str]