Backwards compat change for python < 3.10 (part deux)

beangulp/similar.py

@@ -171,7 +171,7 @@ def cmp(entry1: data.Directive, entry2: data.Directive) -> bool:
 comparator = heuristic_comparator
 
 
-def same_link_comparator(regex: str | None = None) -> Comparator:
+def same_link_comparator(regex: Optional[str] = None) -> Comparator:
     """Comparison function generator that checks if two directives share a link.
 
     You can use this if you have a source of transactions that consistently