light relaxation of RMS for image testing

[jGaboardi]

• light relaxation of RMS for image testing
• verified simply a minor difference in matplotlib installed from pip
  • see result_images-ubuntu-latest-314-dev Artifact or the attached zip¹
• gets CI fully green in again
• adjust release.yml action for trusted publishing #287 (comment)

Footnotes

1. test_legendgram.zip ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.2%. Comparing base (48cef7a) to head (77eb69b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #288   +/-   ##
=====================================
  Coverage   90.2%   90.2%           
=====================================
  Files         11      11           
  Lines       1308    1308           
=====================================
  Hits        1180    1180           
  Misses       128     128           

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