Bump phpunit/phpunit from 11.5.2 to 11.5.3 #256

Job	Run time
PHP 8.3 on ubuntu-latest w/ install	16s
PHP 8.3 on ubuntu-latest w/ update	15s
PHP 8.3 on windows-latest w/ install	40s
PHP 8.3 on windows-latest w/ update	38s
PHP 8.3 on macOS-latest w/ install	1m 19s
PHP 8.3 on macOS-latest w/ update	1m 13s
PHP 8.4 on ubuntu-latest w/ install	12s
PHP 8.4 on ubuntu-latest w/ update	11s
PHP 8.4 on windows-latest w/ install	38s
PHP 8.4 on windows-latest w/ update	44s
PHP 8.4 on macOS-latest w/ install	1m 10s
PHP 8.4 on macOS-latest w/ update	1m 10s
PHP 8.5 on ubuntu-latest w/ install	12s
PHP 8.5 on ubuntu-latest w/ update	20s
PHP 8.5 on windows-latest w/ install	39s
PHP 8.5 on windows-latest w/ update	37s
PHP 8.5 on macOS-latest w/ install	1m 26s
PHP 8.5 on macOS-latest w/ update	1m 22s
	13m 2s

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