ci: remove redundant checkout step from prs cache clean workflow

[qwerty541]

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
github-readme-stats	✅ Ready (Inspect)	Visit Preview	Feb 18, 2024 8:39pm

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (5796024) 98.02% compared to head (dd21012) 98.02%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3655   +/-   ##
=======================================
  Coverage   98.02%   98.02%           
=======================================
  Files          27       27           
  Lines        6275     6275           
  Branches      549      549           
=======================================
  Hits         6151     6151           
  Misses        121      121           
  Partials        3        3           

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