Change redismod docker to redis-stack-server

[dvora-h]

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: 92.25% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (66baef0) compared to base (8592cac).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2556      +/-   ##
==========================================
- Coverage   92.27%   92.25%   -0.03%     
==========================================
  Files         115      115              
  Lines       29613    29613              
==========================================
- Hits        27325    27319       -6     
- Misses       2288     2294       +6     

Impacted Files	Coverage Δ
redis/asyncio/cluster.py	91.68% <0.00%> (-0.33%)	⬇️
tests/test_asyncio/test_cluster.py	97.48% <0.00%> (-0.13%)	⬇️
tests/test_cluster.py	96.84% <0.00%> (-0.11%)	⬇️

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