Maintenance: Update plugin compatibility to WP 6.9

[cbravobernal]

What

Adds compatibility with WP 6.9

[github-actions]

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Props cbravobernal.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 9.37%. Comparing base (36be69d) to head (7da4360).
⚠️ Report is 1 commits behind head on trunk.

Additional details and impacted files

@@           Coverage Diff           @@
##             trunk    #266   +/-   ##
=======================================
  Coverage     9.37%   9.37%           
  Complexity    4288    4288           
=======================================
  Files          266     266           
  Lines        33159   33159           
=======================================
  Hits          3108    3108           
  Misses       30051   30051           

Flag	Coverage Δ
e2e	21.83% <ø> (ø)
phpunit	6.08% <ø> (ø)

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