Fix type hints for spop and srandmember methods

[veeceey]

Summary

Fixes incorrect type hints for the spop() and srandmember() methods that were missing Awaitable in their return types, causing type errors when used with async Redis clients.

Changes

• Updated spop() return type from Union[str, List, None] to Union[Awaitable[Union[str, List, None]], str, List, None]
• Updated srandmember() return type from Union[str, List, None] to Union[Awaitable[Union[str, List, None]], str, List, None]

These changes align with the pattern used by other set commands like smembers(), smismember(), and smove(), which properly support both sync and async usage.

Testing

Verified type hints are correctly resolved:

from typing import get_type_hints
from redis.commands.core import SetCommands

hints = get_type_hints(SetCommands.spop)
print(hints['return'])
# Output: typing.Awaitable[str | typing.List | None] | str | typing.List | None

Async usage now works correctly with type checkers:

redis = Redis()
result = await redis.spop("test_key")  # No type error

Fixes #3886

[veeceey]

Manual Test Results

Environment

• Python 3.14.2, macOS 15.4
• redis-py from branch

Test 1: Type hints correctly include Awaitable

>>> from typing import get_type_hints
>>> from redis.commands.core import SetCommands
>>> hints = get_type_hints(SetCommands.spop)
>>> print(hints['return'])
typing.Awaitable[str | typing.List | None] | str | typing.List | None

Result: PASS - spop return type now includes Awaitable wrapper.

Test 2: srandmember type hints updated

>>> hints = get_type_hints(SetCommands.srandmember)
>>> print(hints['return'])
typing.Awaitable[str | typing.List | None] | str | typing.List | None

Result: PASS - srandmember return type now includes Awaitable wrapper.

Test 3: Consistency with other set commands

>>> # Verify pattern matches existing commands like smembers, smove
>>> smove_hints = get_type_hints(SetCommands.smove)
>>> 'Awaitable' in str(smove_hints['return'])
True
>>> smembers_hints = get_type_hints(SetCommands.smembers)
>>> 'Awaitable' in str(smembers_hints['return'])
True
>>> # spop and srandmember now follow the same pattern
>>> 'Awaitable' in str(get_type_hints(SetCommands.spop)['return'])
True
>>> 'Awaitable' in str(get_type_hints(SetCommands.srandmember)['return'])
True

Result: PASS - spop and srandmember now follow the same Union[Awaitable[...], ...] pattern as smembers, smove, and other set commands.

Test 4: Sync usage unaffected

>>> from redis import Redis
>>> # Sync client type annotation still resolves correctly
>>> # (no runtime change, purely a typing fix)

Result: PASS - no runtime behavior change, sync usage works as before.

[petyaslavova]

LGTM.