Brings a PHP 8.0 related fix, backend module bug fixes
and features representing more v11 related markup.

composer req --dev typo3/cms-styleguide:~11.3.0
composer req --dev typo3/cms-styleguide:~11.3.0 -d typo3/sysext/core --no-update

Change-Id: I716237ad6256db87f6b6e20081a67fa674c203d5
Resolves: #94331
Releases: master
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69479


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>