Add support for PHPUnit 11 #144

Job	Run time
PHP 8.1 on ubuntu-latest (--prefer-lowest)	23s
PHP 8.1 on windows-latest ()	1m 52s
PHP 8.1 on windows-latest (--prefer-lowest)	2m 2s
PHP 8.1 on macOS-latest ()	1s
PHP 8.1 on macOS-latest (--prefer-lowest)	1m 17s
PHP 8.2 on ubuntu-latest ()	23s
PHP 8.2 on ubuntu-latest (--prefer-lowest)	59s
PHP 8.2 on windows-latest ()	1m 25s
PHP 8.2 on windows-latest (--prefer-lowest)	1m 4s
PHP 8.2 on macOS-latest ()	1m 33s
PHP 8.2 on macOS-latest (--prefer-lowest)	1m 54s
PHP 8.3 on ubuntu-latest ()	20s
PHP 8.3 on ubuntu-latest (--prefer-lowest)	1s
PHP 8.3 on windows-latest ()	1m 7s
PHP 8.3 on windows-latest (--prefer-lowest)	57s
PHP 8.3 on macOS-latest ()	46s
PHP 8.3 on macOS-latest (--prefer-lowest)	1m 40s
PHP 8.1 on ubuntu-latest ()	28s
	18m 12s

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