Merge branch 'T3DEMO-343-TYPO3-update' into 'main'

[TASK] Update TYPO3 to v10.4.21

See merge request !78
5 jobs for main in 5 minutes and 2 seconds (queued for 9 seconds)
Status Name Job ID Coverage
  Maintenance
manual Get dump for Content Master #539697
allowed to fail manual
 
  Lint
passed code-analysis:php #539698

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  Build
passed build:php #539699

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  Build Frontend
passed build-frontend #539700

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  Deploy
passed deploy:production #539701

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