Fix: add missing Union type in method StreamCommands.xclaim()

[ant1fact]

Union was missing in front of [List[StreamIdT], Tuple[StreamIdT]] and VSCode was producing an error because of it. After adding Union the type annotation is correctly identified by VSCode.

Pull Request check-list

Please make sure to review and check all of these items:

• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Description of change

Please provide a description of the change here.

[codecov-commenter]

Codecov Report

Base: 92.27% // Head: 92.24% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (d1fa5fc) compared to base (8592cac).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2553      +/-   ##
==========================================
- Coverage   92.27%   92.24%   -0.04%     
==========================================
  Files         115      115              
  Lines       29613    29613              
==========================================
- Hits        27325    27316       -9     
- Misses       2288     2297       +9     

Impacted Files	Coverage Δ
redis/commands/core.py	82.15% <ø> (ø)
redis/asyncio/cluster.py	91.68% <0.00%> (-0.33%)	⬇️
tests/test_cluster.py	96.73% <0.00%> (-0.22%)	⬇️
tests/test_asyncio/test_pubsub.py	99.37% <0.00%> (-0.16%)	⬇️
tests/test_asyncio/test_cluster.py	97.48% <0.00%> (-0.13%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.