fix: test requirements after removing the patching pattern

[fsbraun]

Description

After merging #300 the test requirements need to be fixed against the django-cms/develop-4 branch (which now also contains the changes needed for #300)

Additionally we can now use the latest released djangocms-text-ckeditor since as of 5.1.2 it supports django CMS 4

Related resources

• fix: Remove patching the django CMS core #300
• #...

Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on
  Slack to find a “pr review buddy” who is going to review my pull request.

[codecov]

Codecov Report

Merging #303 (8567add) into master (4567b34) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #303   +/-   ##
=======================================
  Coverage   89.75%   89.75%           
=======================================
  Files          67       67           
  Lines        2196     2196           
  Branches      293      293           
=======================================
  Hits         1971     1971           
  Misses        170      170           
  Partials       55       55           

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