Chore/rework workflow (#52)

* Reworked the lint action
* Removed the file change requirement
* Repaired mypy
* Repaired pip-audit

tests/utils/postgres/entities_test.py

@@ -1,4 +1,4 @@
-def test_import():
+def test_import() -> None:
     from aki_prj23_transparenzregister.utils.postgres import entities
 
     assert entities is not None