[BUGFIX] Respect doctype when generating meta tags

The GenericMetaTagManager as well as the abstract
class (used by extensions) does now properly respect
the current doctype and therefore omits the ending
slash at the end for HTML5.

Resolves: #102058
Releases: main, 12.4
Change-Id: I4ce6bcb61a44aff6eda738f52fe2f2548818ee95
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84375


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>