tests: simplify assertion

Author: Lee-W

tests/test_bump_update_version_in_files.py

@@ -347,8 +347,7 @@ def test_update_version_in_files_return_value(version_files):
 
     # Verify all files in the input are in the returned list
     assert len(updated_files) == len(version_files)
-    for file_path in version_files:
-        assert file_path in updated_files
+    assert set(version_files).issubset(updated_files)
 
     # Verify the returned paths are strings
     for file_path in updated_files: