Revert "ignore auto-generated version file in flake8 tests"

This reverts commit b107dc0.

Author: rstevens011

setup.cfg

@@ -20,7 +20,7 @@ max-line-length = 120
 select = C,E,F,W,B
 # C812, W503 clash with black
 ignore = C812,W503
-exclude = venv,.venv,.tox,dist,doc,build,*.egg,src/aws_secretsmanager_caching/version.py
+exclude = venv,.venv,.tox,dist,doc,build,*.egg
 
 [isort]
 line_length = 120