flake8 is now on github, not gitlab

Author: micaelaw

.pre-commit-config.yaml

@@ -40,7 +40,7 @@ repos:
     hooks:
       - id: python-use-type-annotations
       - id: rst-backticks
-  - repo: https://gitlab.com/pycqa/flake8
+  - repo: https://github.com/pycqa/flake8
     rev: 3.9.2
     hooks:
       - id: flake8