[TASK] Raise friendsofphp/php-cs-fixer:^3.4

The dev dependency friendsofphp/php-cs-fixer now
has a minimum requirement to 3.4, which comes
with PHP8.1 support.

This allows TYPO3 to run PHP-CS Fixer with
PHP 8.1 in the CI pipeline.

Testing configuration is not adjusted with this
patch, but allows using corresponding runTests.sh
testsuites cgl and cglGit:

Build/Scripts/runTests.sh -p 8.1 -s cglGit -n
Build/Scripts/runTests.sh -p 8.1 -s cgl -n

Used command:

composer req friendsofphp/php-cs-fixer:^3.4 --dev

Resolves: #96398
Releases: main, 11.5
Change-Id: I6a4eaec0294829afcdf84b7b32303eaafbaa72bb
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72739


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