Change Sismember Returned Value to int

[shacharPash]

Pull Request check-list

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• 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?

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Description of change

Please provide a description of the change here.
Fixes #2622

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (d95d8a2) 92.26% compared to head (d4b7afc) 92.24%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2634      +/-   ##
==========================================
- Coverage   92.26%   92.24%   -0.02%     
==========================================
  Files         116      116              
  Lines       30217    30217              
==========================================
- Hits        27879    27873       -6     
- Misses       2338     2344       +6     

Impacted Files	Coverage Δ
redis/client.py	89.60% <ø> (ø)
redis/commands/core.py	82.04% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[chayim]

@dvora-h for 5.x?

[chayim]

closed by #2813