Follow flake8's pre-commit repo from GitLab to GitHub

Author: kurtmckee

.pre-commit-config.yaml

@@ -8,7 +8,7 @@ repos:
     hooks:
       - id: black
         args: [ '--safe' ]
-  - repo: https://gitlab.com/pycqa/flake8
+  - repo: https://github.com/pycqa/flake8
     rev: 4.0.1
     hooks:
       - id: flake8