Re-record VCR cassettes

[vaszig]

Closes #4777 (partially)

• Re-recorded all cassettes (except for the ones which make use of known-broken links)
• Updated docs concerning the release flow (VCR re-recording section)
• Updated certificate for KVK since the previous was failing (CERTIFICATE_VERIFY_FAILED)

Checklist

Check off the items that are completed or not relevant.

• Impact on features

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

• Release management

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

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

  • [x] Ran ./bin/makemessages_js.sh
  • [x] Ran ./bin/compilemessages_js.sh

• Commit hygiene

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.57%. Comparing base (84cdb24) to head (26cb8bf). Report is 14 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4781 +/- ## ======================================= Coverage 96.57% 96.57% ======================================= Files 746 746 Lines 25271 25271 Branches 3332 3332 ======================================= Hits 24406 24406 Misses 602 602 Partials 263 263 ```

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