fix another typing issue

ianalyzer_readers/extract.py

@@ -635,7 +635,7 @@ def _apply(self, graph: Graph = None, subject: BNode = None, *nargs, **kwargs) -
             return [self.get_node_value(node) for node in nodes]
         return self.get_node_value(nodes[0])
 
-    def _select(self, graph, subject, predicates: Iterable[URIRef]) -> List[Union[Literal | URIRef | BNode]]:
+    def _select(self, graph, subject, predicates: Iterable[URIRef]) -> List[Union[Literal, URIRef, BNode]]:
         ''' search in a graph with predicates
             if more than one predicate is passed, this is a recursive query:
             the first search result of the query is used as a subject in the next query