Mark TOPK.COUNT as deprecated

[dvora-h]

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)?
• Was the change added to CHANGES file?

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Description of change

closes #2351

[codecov-commenter]

Codecov Report

Merging #2363 (c9a16c8) into master (ab5d407) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2363      +/-   ##
==========================================
- Coverage   92.21%   92.19%   -0.02%     
==========================================
  Files         111      111              
  Lines       28782    28788       +6     
==========================================
+ Hits        26540    26542       +2     
- Misses       2242     2246       +4     

Impacted Files	Coverage Δ
redis/commands/bf/commands.py	98.39% <100.00%> (+0.01%)	⬆️
tests/test_asyncio/test_bloom.py	99.58% <100.00%> (+<0.01%)	⬆️
tests/test_bloom.py	99.60% <100.00%> (+<0.01%)	⬆️
tests/test_cluster.py	96.85% <0.00%> (-0.24%)	⬇️

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