refactor: move flake8 config (#7167)

* refactor: move flake8 config

* Update .pre-commit-config.yaml

Co-authored-by: Christian Clauss <cclauss@me.com>

.flake8

@@ -1,3 +1,8 @@
 [flake8]
+max-line-length = 88
+max-complexity = 25
 extend-ignore =
     A003  # Class attribute is shadowing a python builtin
+    # Formatting style for `black`
+    E203  # Whitespace before ':'
+    W503  # Line break occurred before a binary operator

.pre-commit-config.yaml

@@ -35,11 +35,7 @@ repos:
   - repo: https://github.com/PyCQA/flake8
     rev: 5.0.4
     hooks:
-      - id: flake8
-        args:
-          - --ignore=E203,W503
-          - --max-complexity=25
-          - --max-line-length=88
+      - id: flake8 # See .flake8 for args
         additional_dependencies:
           - flake8-bugbear
           - flake8-builtins