chore: add tests for PHP 8.4 #164

Job	Run time
PHP 8.1, SF 5.4.* - highest	2m 32s
PHP 8.1, SF 6.3.* - highest	18s
PHP 8.1, SF 6.4.* - highest	24s
PHP 8.2, SF 5.4.* - highest	20s
PHP 8.2, SF 6.3.* - highest	19s
PHP 8.2, SF 6.4.* - highest	2m 28s
PHP 8.3, SF 5.4.* - highest	18s
PHP 8.3, SF 6.3.* - highest	2m 26s
PHP 8.3, SF 6.4.* - highest	18s
PHP 8.1, SF * - lowest	2m 30s
PHP 8.3, SF 7.0.* -	2m 26s
PHP 8.3, SF 7.1.* -	17s
PHP 8.4, SF 7.1.* -	2m 26s
composer-validate / Validate composer.json	11s
cs / PHP Coding Standards	8s
sca / Static Code Analysis	14s
	17m 35s

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