chore(deps): update actions/stale action to v9

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/stale	action	major	v8 -> v9

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Release Notes

actions/stale (actions/stale)

v9

Compare Source

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Configuration

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🚦 Automerge: Enabled.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ab22517) 65.62% compared to head (46626c9) 65.62%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #252   +/-   ##
=======================================
  Coverage   65.62%   65.62%           
=======================================
  Files           3        3           
  Lines          64       64           
  Branches       21       21           
=======================================
  Hits           42       42           
  Misses         20       20           
  Partials        2        2           

Flag	Coverage Δ
unittests	65.62% <ø> (ø)

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