fix: remove unused parameter from _get_protected_snapshot_ids method

Author: ForeverAngry

pyiceberg/table/maintenance.py

@@ -259,7 +259,7 @@ def expire_snapshots_with_retention_policy(
         if snapshots_to_expire:
             self._expire_snapshots_by_ids(snapshots_to_expire)
 
-    def _get_protected_snapshot_ids(self, table_metadata: TableMetadata) -> Set[int]:
+    def _get_protected_snapshot_ids(self) -> Set[int]:
         """Get the IDs of protected snapshots.
 
         These are the HEAD snapshots of all branches and all tagged snapshots.