Tests

ci: Add tests for PHP 8.5 #70

Job	Run time
PHPCS	19s
Psalm	14s
PHPStan	16s
PHPUnit on 7.3	10s
PHPUnit on 7.4	9s
PHPUnit on 8.2	12s
PHPUnit on 7.2	11s
PHPUnit on 7.1	12s
PHPUnit on 8.3	12s
PHPUnit on 8.4 --ignore-platform-req=php	12s
PHPUnit on 8.0	12s
PHPUnit on 8.1	12s
PHPUnit on 8.5 --ignore-platform-req=php	12s
	2m 43s

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