[CI] Use php-cs-fixer directly

[brotkrueml]

The typo3/coding-standards package isn't compatible with Symfony 7 yet. But as this is only a proxy package for php-cs-fixer defining some rules, we can use php-cs-fixer directly.

The configuration from the TYPO3 Core is used.

See: https://github.com/TYPO3/typo3/blob/main/Build/php-cs-fixer/config.php
Related: TYPO3-Documentation/Changelog-To-Doc#786
Releases: main, 12.4

[brotkrueml]

The PHP minimum version is fixed with #419.

[github-actions]

The backport to 12.4 failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply cdabb54... [CI] Use php-cs-fixer directly
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

stdout

Auto-merging composer.json
CONFLICT (content): Merge conflict in composer.json

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-12.4 12.4
# Navigate to the new working tree
cd .worktrees/backport-12.4
# Create a new branch
git switch --create backport-420-to-12.4
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick cdabb54a689cb4fbef4bdb6b4613228197ad4a52
# Push it to GitHub
git push --set-upstream origin backport-420-to-12.4
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-12.4

Then, create a pull request where the base branch is 12.4 and the compare/head branch is backport-420-to-12.4.