Remove the unneeded suppression (apache#2654)

# Rationale for this change

## Are these changes tested?

## Are there any user-facing changes?

Author: Fokko

tests/utils/test_manifest.py

@@ -48,7 +48,7 @@
 @pytest.fixture(autouse=True)
 def clear_global_manifests_cache() -> None:
     # Clear the global cache before each test
-    _manifests.cache_clear()  # type: ignore
+    _manifests.cache_clear()
 
 
 def _verify_metadata_with_fastavro(avro_file: str, expected_metadata: Dict[str, str]) -> None: