commit message: fix(redis-client): normalize optional parameter annotations and correct arrtrim return type

body: replaced all Union[T, None] = None and bare T = None with Optional[T] = None; changed arrtrim return annotation to Optional[int]

Author: kesha1225

redis/commands/json/commands.py

@@ -89,7 +89,7 @@ def arrpop(
 
     def arrtrim(
         self, name: str, path: str, start: int, stop: int
-    ) -> List[Optional[int]]:
+    ) -> Optional[int]:
         """Trim the array JSON value under ``path`` at key ``name`` to the
         inclusive range given by ``start`` and ``stop``.