chore: exempt dependencies, autorelease PRs from unmaintained-package autoclose

[pichlermarc]

See #2275, the stale label was applied and the bot commented even though it's a release PR (changes to unmaintained packages were part of that).

This PR addresses two issues:

• To prevent release-please and renovate-bot from running into the 14-day autoclose for unmaintained packages this PR adds the labels dependencies and autorelease:pending to the exempt labels.
• To avoid misunderstandings, use pkg-status:unmaintained:autoclose-scheduled label instead of stale

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.42%. Comparing base (dfb2dff) to head (e4f1288).
Report is 180 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2304      +/-   ##
==========================================
- Coverage   90.97%   90.42%   -0.56%     
==========================================
  Files         146      148       +2     
  Lines        7492     7322     -170     
  Branches     1502     1518      +16     
==========================================
- Hits         6816     6621     -195     
- Misses        676      701      +25     

see 62 files with indirect coverage changes