Change 'zrange' args type hints - adding Optional type hint for args that can be None

CHANGES

@@ -1146,3 +1146,4 @@ incompatible in code using*SCAN commands loops such as
   * Implemented STRLEN
   * Implemented PERSIST
   * Implemented SETRANGE
+  * Changed type annotation of the `num` parameter in `zrange` from `int` to `Optional[int]

redis/commands/core.py

@@ -4458,7 +4458,7 @@ def zrange(
         byscore: bool = False,
         bylex: bool = False,
         offset: int = None,
-        num: int = None,
+        num: Optional[int] = None,
     ) -> ResponseT:
         """
         Return a range of values from sorted set ``name`` between