[6.14.z] Bump flake8 from 6.1.0 to 7.0.0 (#13629)

requirements-optional.txt

@@ -1,5 +1,5 @@
 # For running tests and checking code quality using these modules.
-flake8==6.1.0
+flake8==7.0.0
 pytest-cov==4.1.0
 redis==5.0.1
 pre-commit==3.6.0