[TASK] Allow usage of symfony 7

This change enables Symfony 7 in
addition to symfony 6 in TYPO3.

Symfony7 requires PHP 8.2, thus
is not installed by default for the
time being, as this change is also
allowed for TYPO3 v12 support when
running with PHP 8.2 and composer.

Used commands:

composer req -W \
 "symfony/config:^6.4 || ^7.0" \
 "symfony/console:^6.4 || ^7.0" \
 "symfony/dependency-injection:^6.4 || ^7.0" \
 "symfony/doctrine-messenger:^6.4 || ^7.0" \
 "symfony/expression-language:^6.4 || ^7.0" \
 "symfony/filesystem:^6.4 || ^7.0" \
 "symfony/finder:^6.4 || ^7.0" \
 "symfony/http-foundation:^6.4 || ^7.0" \
 "symfony/mailer:^6.4 || ^7.0" \
 "symfony/messenger:^6.4 || ^7.0" \
 "symfony/mime:^6.4 || ^7.0" \
 "symfony/options-resolver:^6.4 || ^7.0" \
 "symfony/property-access:^6.4 || ^7.0" \
 "symfony/property-info:^6.4 || ^7.0" \
 "symfony/rate-limiter:^6.4 || ^7.0" \
 "symfony/routing:^6.4 || ^7.0" \
 "symfony/uid:^6.4 || ^7.0" \
 "symfony/var-dumper:^6.4 || ^7.0" \
 "symfony/yaml:^6.4 || ^7.0"

 c...