This change adds the symfony/polyfill-php81
package as dependency.

In addition, EXT:form does not explicitly
depend on symfony/polyfill-php80 anymore,
as this is not needed, since EXT:core
handles this dependency directly.

Used composer commands:

> composer req symfony/polyfill-php81
> composer req symfony/polyfill-php81 -d typo3/sysext/core --no-update
> composer remove symfony/polyfill-php80 -d typo3/sysext/form

Resolves: #95666
Releases: master
Change-Id: Ib7553478167af36f1bf4c4da17fd225abf466c05
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71809


Tested-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>