support PHPUnit 10 (fixes #85, via #86) #133

Job	Run time
PHP 8.1 on ubuntu-latest ()	22s
PHP 8.1 on ubuntu-latest (--prefer-lowest)	22s
PHP 8.1 on windows-latest ()	2m 5s
PHP 8.1 on windows-latest (--prefer-lowest)	1m 59s
PHP 8.1 on macOS-latest ()	1m 30s
PHP 8.1 on macOS-latest (--prefer-lowest)	9m 5s
PHP 8.2 on ubuntu-latest ()	31s
PHP 8.2 on ubuntu-latest (--prefer-lowest)	33s
PHP 8.2 on windows-latest ()	1m 38s
PHP 8.2 on windows-latest (--prefer-lowest)	1m 16s
PHP 8.2 on macOS-latest ()	51s
PHP 8.2 on macOS-latest (--prefer-lowest)	46s
PHP 8.3 on ubuntu-latest ()	43s
PHP 8.3 on ubuntu-latest (--prefer-lowest)	47s
PHP 8.3 on windows-latest ()	1m 32s
PHP 8.3 on windows-latest (--prefer-lowest)	1m 5s
PHP 8.3 on macOS-latest ()	1m 30s
PHP 8.3 on macOS-latest (--prefer-lowest)	2m 8s
	28m 43s

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