[7.3-stable] CI: Set workflow permissions

[alchemycms-bot]

Backport

This will backport the following commits from main to 7.3-stable:

• Merge pull request #3139 from tvdeyen/set-actions-permissions

Questions ?

Please refer to the Backport tool documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.47%. Comparing base (cc0bb4c) to head (21a0886).
Report is 5 commits behind head on 7.3-stable.

Additional details and impacted files

@@             Coverage Diff             @@
##           7.3-stable    #3140   +/-   ##
===========================================
  Coverage       96.47%   96.47%           
===========================================
  Files             237      237           
  Lines            6419     6419           
===========================================
  Hits             6193     6193           
  Misses            226      226           

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