chore: fix stale-issue-cleanup version

[mrgrain]

Explicitly define version. They've stopped publishing major version tag for some reason.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.46%. Comparing base (fccc5f9) to head (996814c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #851      +/-   ##
==========================================
- Coverage   82.67%   82.46%   -0.21%     
==========================================
  Files          65       65              
  Lines        9558     9558              
  Branches     1120     1114       -6     
==========================================
- Hits         7902     7882      -20     
- Misses       1632     1654      +22     
+ Partials       24       22       -2     

Flag	Coverage Δ
suite.unit	82.46% <ø> (-0.21%)	⬇️

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