[TASK] Update Bootstrap to 5.0.1

Executed command:

  yarn add "bootstrap@^5.0.1"

Also, some minor coding issues were solved that popped up
with the update.

Resolves: #94138
Releases: master
Change-Id: Ie80eff09efba43cfb9ae60862cb2167b0bc3f12f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69146


Tested-by: core-ci <typo3@b13.com>
Tested-by: Richard Haeser <richard@richardhaeser.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Richard Haeser <richard@richardhaeser.com>
Reviewed-by: Benni Mack <benni@typo3.org>