bump to PHP 8.3 + update deps + allow it in CI #32050

Job	Run time
Help and Version	18s
Composer Validate	14s
Avoid duplicate short class names	16s
Check fixture classes are different to nodes	24s
Finalize classes	26s
Preload php-parser Order	21s
Check before/after test fixture on no-changes	16s
Run with Space in Directory	16s
PHPStan	1m 24s
Check no "*.php" files in rules Fixture directory	21s
Commented Code	21s
Active Classes	18s
Compatible PHPStan versions	16s
PHP Linter	27s
Detect composer dependency issues	19s
	5m 57s

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