update certificates for unit tests

[annashamray]

Changes

• test certificates are updated

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
  • Checked new model fields are usable in the admin
  • Problem detection in the admin email digest is handled

• 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

• Documentation

  • Added documentation which describes the changes

[vaszig]

Let's wait for th CI of course, but approving this.
Thanks for updating the dates in the comments too!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.07%. Comparing base (bfec5a1) to head (9073ff8).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6122   +/-   ##
=======================================
  Coverage   97.07%   97.07%           
=======================================
  Files         883      883           
  Lines       33219    33219           
  Branches     2977     2977           
=======================================
  Hits        32248    32248           
  Misses        655      655           
  Partials      316      316           

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[annashamray]

Backports:
3.3.x: 78f54a8
3.4.x: 99e2801