chore: provide explicit type hints for profession oids in hash calcul…

…ation

Signed-off-by: oleg.hoefling <[email protected]>

src/cryptography/x509/extensions.py

@@ -2311,7 +2311,7 @@ def __eq__(self, other: object) -> bool:
 
     def __hash__(self) -> int:
         if self.profession_oids is None:
-            profession_oids = (None,)
+            profession_oids: tuple[ObjectIdentifier | None, ...] = (None,)
         else:
             profession_oids = tuple(self.profession_oids)
         return hash(