Add PHP 8.4 support (testing) #971

Job	Run time
PHPUnit (PHP 8.1)	23s
PHPUnit (PHP 8.2)	13s
php-cs-fixer	30s
phpstan	34s
Define Matrix	7s
PHPUnit (PHP 8.3)	14s
Build PHP Test (PHP 8.1 macos-14)	19m 37s
Build PHP Test (PHP 8.1 ubuntu-latest)	27m 50s
Build PHP Test (PHP 8.1 macos-13)	36m 25s
Build PHP Test (PHP 8.1 windows-latest)	18m 30s
Build PHP Test (PHP 8.2 macos-14)	20m 20s
Build PHP Test (PHP 8.2 ubuntu-latest)	28m 40s
Build PHP Test (PHP 8.2 macos-13)	39m 19s
Build PHP Test (PHP 8.2 windows-latest)	17m 48s
Build PHP Test (PHP 8.3 macos-14)	16m 3s
Build PHP Test (PHP 8.3 ubuntu-latest)	28m 59s
Build PHP Test (PHP 8.3 macos-13)	36m 29s
Build PHP Test (PHP 8.3 windows-latest)	18m 11s
Build PHP Test (PHP 8.4 macos-14)	17m 41s
Build PHP Test (PHP 8.4 ubuntu-latest)	28m 14s
Build PHP Test (PHP 8.4 macos-13)	46m 24s
Build PHP Test (PHP 8.4 windows-latest)	16m 23s
	6h 58m 54s

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