Fix CI issue after flake8 update 5 → 6

PyCQA/flake8#1760

Fix incorrect `setup.cfg` syntax.

setup.cfg

@@ -27,14 +27,22 @@ all_files  = 1
 
 [flake8]
 ignore =
-  D205,D209,D400  # our docstrings are multi-line blobs
-  D302  # We don't care about Unicode docstrings
-  E731  # we occasionally use lambda
-  F403,F405  # we use * imports
-  Q001  # we use '''...''' multi-line strings
-  Q003  # don't force "" strings to avoid escaping quotes
-  T001,T201  # we use print statements in the update scripts
-  W504  # we put the binary operator on the preceding line
+  # our docstrings are multi-line blobs
+  D205,D209,D400,
+  # We don't care about Unicode docstrings
+  D302,
+  # we occasionally use lambda
+  E731,
+  # we use * imports
+  F403,F405,
+  # we use '''...''' multi-line strings
+  Q001,
+  # don't force "" strings to avoid escaping quotes
+  Q003,
+  # we use print statements in the update scripts
+  T001,T201,
+  # we put the binary operator on the preceding line
+  W504,
 max-complexity = 15
 max-line-length = 120