[TASK] Update ckeditor to 4.15.0

Executed commands:

  cd Build
  yarn add ckeditor4@^4.15.0
  yarn build

Resolves: #92412
Releases: master, 10.4, 9.5
Change-Id: Ic8784894a9fbfdc98656e5fb4875bfcc9b0443c6
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65878


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>