Fix type hints for spop and srandmember methods (#3943)

The spop() and srandmember() methods were missing Awaitable in their
return type hints, causing type errors when used with async Redis
clients. Updated both methods to return Union[Awaitable[Union[str,
List, None]], str, List, None] to properly support both sync and
async usage, matching the pattern used by other set commands like
smembers, smismember, and smove.

Fixes #3886

Co-authored-by: petyaslavova <petya.slavova@redis.com>

Author: veeceey

redis/commands/core.py

@@ -3761,7 +3761,9 @@ def smove(self, src: KeyT, dst: KeyT, value: str) -> Union[Awaitable[bool], bool
         """
         return self.execute_command("SMOVE", src, dst, value)
 
-    def spop(self, name: KeyT, count: Optional[int] = None) -> Union[str, List, None]:
+    def spop(
+        self, name: KeyT, count: Optional[int] = None
+    ) -> Union[Awaitable[Union[str, List, None]], str, List, None]:
         """
         Remove and return a random member of set ``name``
 
@@ -3772,7 +3774,7 @@ def spop(self, name: KeyT, count: Optional[int] = None) -> Union[str, List, None
 
     def srandmember(
         self, name: KeyT, number: Optional[int] = None
-    ) -> Union[str, List, None]:
+    ) -> Union[Awaitable[Union[str, List, None]], str, List, None]:
         """
         If ``number`` is None, returns a random member of set ``name``.