chore: update pre-commit hook pycqa/flake8 to v6.1.0

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2737>

.pre-commit-config.yaml

@@ -53,7 +53,7 @@ repos:
       - id: isort
 
   - repo: https://github.com/pycqa/flake8
-    rev: 6.0.0
+    rev: 6.1.0
     hooks:
       - id: flake8