Allow ssl_ca_path with rediss:// urls

[chayim]

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)?

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afterwards / while the PR is open.

Description of change

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[codecov-commenter]

Codecov Report

Merging #1814 (964c8b2) into master (18c6809) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1814      +/-   ##
==========================================
+ Coverage   94.29%   94.32%   +0.02%     
==========================================
  Files          75       75              
  Lines       15783    15783              
==========================================
+ Hits        14883    14887       +4     
+ Misses        900      896       -4     

Impacted Files	Coverage Δ
redis/client.py	89.96% <ø> (ø)
tests/test_cluster.py	98.79% <0.00%> (+0.12%)	⬆️
tests/conftest.py	91.13% <0.00%> (+0.98%)	⬆️

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