ci: remove stale bot workflow

[phm07]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.93%. Comparing base (98dce77) to head (0fed422).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #605   +/-   ##
=======================================
  Coverage   96.93%   96.93%           
=======================================
  Files          74       74           
  Lines        3984     3984           
=======================================
  Hits         3862     3862           
  Misses        122      122           

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