Add PHP 8.4 support (testing) #976

Job	Run time
phpstan	29s
php-cs-fixer	27s
PHPUnit (PHP 8.1)	13s
Define Matrix	9s
PHPUnit (PHP 8.2)	10s
PHPUnit (PHP 8.3)	12s
Build PHP Test (PHP 8.1 macos-14)	22m 19s
Build PHP Test (PHP 8.1 ubuntu-latest)	27m 24s
Build PHP Test (PHP 8.1 macos-13)	40m 41s
Build PHP Test (PHP 8.1 windows-latest)	17m 22s
Build PHP Test (PHP 8.2 macos-14)	17m 6s
Build PHP Test (PHP 8.2 ubuntu-latest)	27m 39s
Build PHP Test (PHP 8.2 macos-13)	38m 59s
Build PHP Test (PHP 8.2 windows-latest)	16m 46s
Build PHP Test (PHP 8.3 macos-14)	21m 41s
Build PHP Test (PHP 8.3 ubuntu-latest)	27m 40s
Build PHP Test (PHP 8.3 macos-13)	46m 29s
Build PHP Test (PHP 8.3 windows-latest)	16m 47s
Build PHP Test (PHP 8.4 macos-14)	17m 25s
Build PHP Test (PHP 8.4 ubuntu-latest)	28m 19s
Build PHP Test (PHP 8.4 macos-13)	40m 53s
Build PHP Test (PHP 8.4 windows-latest)	17m 6s
	7h 6m 16s

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