Change redismod docker to redis-stack-server (#2556)

[zach-iee]

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?

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Description of change

this fixes the issue of standalone tests failing due to redis not booting up

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.02% 🎉

Comparison is base (68ef50a) 60.19% compared to head (4f4f027) 60.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##              4.4      #12      +/-   ##
==========================================
+ Coverage   60.19%   60.21%   +0.02%     
==========================================
  Files         116      116              
  Lines       30282    30282              
==========================================
+ Hits        18228    18235       +7     
+ Misses      12054    12047       -7     

see 5 files with indirect coverage changes

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