[qa] Fix the url of flake8 from gitlab to github.

.pre-commit-config.yaml

@@ -10,7 +10,7 @@ repos:
     rev: 22.3.0
     hooks:
       - id: black
-  - repo: https://gitlab.com/pycqa/flake8
+  - repo: https://github.com/pycqa/flake8
     rev: 3.9.2
     hooks:
       - id: flake8