Fix for lpop and rpop return typing

[Galtozzy]

Right now there is an annoying warning that these methods can't be awaited when using redis.asyncio, even tho it does work with no problems.

Description of change

Very minor change.
Fixed type annotation for lpop and rpop methods.

[codecov-commenter]

Codecov Report

Base: 92.29% // Head: 92.27% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (5c121df) compared to base (fd7a79d).
Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2590      +/-   ##
==========================================
- Coverage   92.29%   92.27%   -0.03%     
==========================================
  Files         115      115              
  Lines       29744    29744              
==========================================
- Hits        27453    27446       -7     
- Misses       2291     2298       +7     

Impacted Files	Coverage Δ
redis/commands/core.py	82.15% <100.00%> (ø)
tests/test_cluster.py	96.64% <0.00%> (-0.33%)	⬇️
tests/test_asyncio/test_pubsub.py	99.37% <0.00%> (-0.16%)	⬇️

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