Skip a maven encoding validation test broken by expat

---

Migrated from D7232 (view on Phabricator)

swh/indexer/tests/test_metadata.py

@@ -7,6 +7,7 @@ import json
 import unittest
 
 from hypothesis import HealthCheck, given, settings, strategies
+import pytest
 
 from swh.indexer.codemeta import CODEMETA_TERMS
 from swh.indexer.metadata import ContentMetadataIndexer, RevisionMetadataIndexer
@@ -701,6 +702,9 @@ RIS, schema.org, CodeMeta, and .zenodo.json.""",
             self.assertEqual(cm.output, [expected_warning])
         self.assertEqual(result, None)
 
+    @pytest.mark.skip(
+        reason="expat 2.2.10-2+deb11u makes this fail for unrelated reason"
+    )
     def test_compute_metadata_maven_invalid_encoding(self):
         expected_warning = (
             "WARNING:swh.indexer.metadata_dictionary.maven.MavenMapping:"