chore: don't run pm workflow on forks

[jonas-jonas]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[github-actions]

Codeball: LGTM! 👍

confidence: 0.96 | [dashboard]

[github-actions]

Codeball: LGTM! 👍

confidence: 0.96 | [dashboard]

[codecov]

Codecov Report

Merging #3229 (2f432ab) into master (52f0740) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 2f432ab differs from pull request most recent head b51e58d. Consider uploading reports for the commit b51e58d to get more accurate results

@@            Coverage Diff             @@
##           master    #3229      +/-   ##
==========================================
- Coverage   77.94%   77.92%   -0.03%     
==========================================
  Files         319      319              
  Lines       20431    20431              
==========================================
- Hits        15925    15920       -5     
- Misses       3310     3312       +2     
- Partials     1196     1199       +3     

see 2 files with indirect coverage changes

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