pre-commit: small fix.

.pre-commit-config.yaml

@@ -90,7 +90,7 @@ repos:
           - bandit
           - pyroma
 
-  - repo: https://gitlab.com/pycqa/flake8.git
+  - repo: https://github.com/pycqa/flake8.git
     rev: 3.9.2
     hooks:
       - id: flake8