Prepare patch release 3.0.2

[robinmolen]

Partly closes #5055

Changes

• Bumped version to 3.0.2
• Updated changelog

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • Checked copying a form
  • Checked import/export of a form
  • Config checks in the configuration overview admin page
  • Problem detection in the admin email digest is handled

• Release management

  • I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • Ran ./bin/makemessages_js.sh
  • Ran ./bin/compilemessages_js.sh

• Dockerfile/scripts

  • Updated the Dockerfile with the necessary scripts from the ./bin folder

• Commit hygiene

  • Commit messages refer to the relevant Github issue
  • Commit messages explain the "why" of change, not the how

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.65%. Comparing base (1958706) to head (1efdd3b).
Report is 2 commits behind head on stable/3.0.x.

Additional details and impacted files

@@              Coverage Diff              @@
##           stable/3.0.x    #5057   +/-   ##
=============================================
  Coverage         96.65%   96.65%           
=============================================
  Files               761      761           
  Lines             25984    25984           
  Branches           3397     3397           
=============================================
  Hits              25116    25116           
  Misses              602      602           
  Partials            266      266           

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