Rename 'update_supported_erros' to 'update_supported_errors' in Retry module

[Ankhas]

Pull Request check-list

• 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?

Description of change

In the Retry module, a function was named update_supported_erros. I rename it to update_supported_errors

[codecov-commenter]

Codecov Report

Merging #2144 (e8defb7) into master (6ba4641) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2144      +/-   ##
==========================================
+ Coverage   92.44%   92.46%   +0.02%     
==========================================
  Files         104      104              
  Lines       24385    24385              
==========================================
+ Hits        22542    22547       +5     
+ Misses       1843     1838       -5     

Impacted Files	Coverage Δ
redis/connection.py	86.53% <100.00%> (ø)
redis/retry.py	100.00% <100.00%> (ø)
redis/asyncio/connection.py	84.83% <0.00%> (+0.11%)	⬆️
tests/test_cluster.py	97.60% <0.00%> (+0.23%)	⬆️

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[chayim]

Thank you for fixing this!