Make it possible to customize SSL ciphers

[gerzse]

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Description of change

Given that Python 3.10 changed the default list of TLS ciphers, it is a good idea to allow customization of the list of ciphers when using Redis with TLS. In some situations the client is unusable right now with older servers and Python >= 3.10.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.84%. Comparing base (2f88840) to head (1e2998a).
Report is 20 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3214      +/-   ##
==========================================
- Coverage   91.84%   91.84%   -0.01%     
==========================================
  Files         128      128              
  Lines       33232    33382     +150     
==========================================
+ Hits        30523    30660     +137     
- Misses       2709     2722      +13     

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[uglide]

LGTM