[stable-2.15] tests: replace a mock import with unittest.mock (#80589) (#80603)

(cherry picked from commit f4615d69ad)

Co-authored-by: Maxwell G <maxwell@gtmx.me>

test/units/ansible_test/test_validate_modules.py

@@ -1,9 +1,9 @@
 """Tests for validate-modules regexes."""
 from __future__ import annotations
 
-import mock
 import pathlib
 import sys
+from unittest import mock
 
 import pytest