fix: changed list type to single element type

[Olegt0rr]

Pull Request check-list

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Description of change

Fixes #2202

[codecov-commenter]

Codecov Report

Merging #2203 (95818cc) into master (9167a0e) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2203   +/-   ##
=======================================
  Coverage   91.99%   91.99%           
=======================================
  Files         108      108           
  Lines       27373    27373           
=======================================
  Hits        25183    25183           
  Misses       2190     2190           

Impacted Files	Coverage Δ
redis/commands/core.py	82.99% <100.00%> (ø)

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