Attempt to fix incompatibility between coverage and idxml

Author: RalfG

psm_utils/io/idxml.py

@@ -158,7 +158,9 @@ def _parse_idxml(self) -> tuple[Any, Any]:
         """
         protein_ids: Any = []  # list[oms.ProteinIdentification]
         peptide_ids: Any = []  # list[oms.PeptideIdentification]
-        oms.IdXMLFile().load(str(self.filename), protein_ids, peptide_ids)  # type: ignore
+
+        idxml_file = oms.IdXMLFile()  # type: ignore
+        idxml_file.load(str(self.filename), protein_ids, peptide_ids)
 
         if len(protein_ids) == 0:
             raise IdXMLReaderEmptyListException(
@@ -564,7 +566,8 @@ def _update_existing_ids(
 
             peptide_id.setHits(updated_peptide_hits)
 
-        oms.IdXMLFile().store(str(self.filename), self.protein_ids, self.peptide_ids)  # type: ignore
+        idxml_file = oms.IdXMLFile()  # type: ignore
+        idxml_file.store(str(self.filename), self.protein_ids, self.peptide_ids)
 
     def _update_peptide_hit(self, peptide_hit: Any, psm: PSM) -> None:
         """Inplace update of PeptideHit with novel predicted features information from PSM."""
@@ -624,7 +627,8 @@ def _create_ids_for_collection(
 
         # Write idXML file
         filename = "/".join(filter(None, [collection, str(self.filename)]))
-        oms.IdXMLFile().store(filename, self.protein_ids, self.peptide_ids)  # type: ignore
+        idxml_file = oms.IdXMLFile()  # type: ignore
+        idxml_file.store(filename, self.protein_ids, self.peptide_ids)
 
     def _create_peptide_identification(
         self,