fix linter and python tests

Author: nammn

docker/mongodb-kubernetes-tests/kubetester/mongotester.py

@@ -258,14 +258,7 @@ def assert_scram_sha_authentication(
                 if i == 0:
                     fail(f"unable to authenticate after {attempts} attempts with error: {e}")
 
-                # Use adaptive retry delays for better password propagation handling
-                remaining_attempts = i
-                if remaining_attempts >= attempts * 0.7:  # First ~30% of attempts
-                    delay = 10  # Longer delay for initial propagation
-                else:
-                    delay = 5  # Standard delay for normal retries
-
-                time.sleep(delay)
+                time.sleep(5)
 
     def assert_scram_sha_authentication_fails(
         self,