Sync flake8 version across requirements (#11580)

.pre-commit-config.yaml

@@ -6,7 +6,7 @@ repos:
       language_version: python3.7
       additional_dependencies: ['click==8.0.4']
 -   repo: https://gitlab.com/pycqa/flake8
-    rev: 3.9.2
+    rev: 5.0.4
     hooks:
     - id: flake8
       args:

requirements.txt

@@ -28,7 +28,7 @@ cython>=0.25,<3.0
 pytest>=5.2.0,!=7.1.0
 pytest-timeout>=1.3.0,<2.0.0
 mock>=2.0.0,<3.0.0
-flake8>=3.8.0,<3.10.0
+flake8>=3.8.0,<6.0.0
 hypothesis>=3.27.0,<7.0.0
 mypy>=0.980,<0.990; platform_machine != "aarch64" and python_version >= "3.7"
 types-dataclasses>=0.1.3; python_version < "3.7"