Fix type hint annotations of expire time

[lucas-six]

Pull Request check-list

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• Does $ tox pass with this change (including linting)?
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Description of change

ExpiryT includes float type, but params of expiry-time (ex, px) for methods such as set, setex, expire, pexpire, pesetex, getex, etc. , should be int, not float.

So we should replace float with int for ExpireT.

[codecov-commenter]

Codecov Report

Merging #2361 (01d5104) into master (ab5d407) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2361      +/-   ##
==========================================
- Coverage   92.21%   92.20%   -0.01%     
==========================================
  Files         111      111              
  Lines       28782    28782              
==========================================
- Hits        26540    26538       -2     
- Misses       2242     2244       +2     

Impacted Files	Coverage Δ
redis/typing.py	86.48% <100.00%> (ø)
tests/test_cluster.py	96.96% <0.00%> (-0.12%)	⬇️

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[lucas-six]

reopen PR for re-running checks.