feat: add support for PHP 8 attributes and symfony 7 #96

Job	Run time
build-source	12s
php-xdebug-docker (8.1, 3.1.5)	1m 15s
php-xdebug-docker (8.2, 3.2.1)	1m 18s
php-xdebug-docker (8.3, 3.3.1)	1m 20s
confluent-integration (latest)	1m 33s
ci-checks (8.1, --prefer-lowest)	33s
confluent-integration (4.1.4)	47s
ci-checks (8.2, --prefer-lowest)	20s
confluent-integration (5.5.2)	1m 7s
ci-checks (8.3, --prefer-lowest)	35s
ci-checks (8.1, --prefer-stable)	44s
ci-checks (8.2, --prefer-stable)	43s
ci-checks (8.2, --prefer-stable)	52s
	11m 19s

Provide feedback