Bump phpunit/phpunit from 10.5.16 to 10.5.18 #245

Job	Run time
PHP 8.2 on ubuntu-latest w/ install	15s
PHP 8.2 on ubuntu-latest w/ update	21s
PHP 8.2 on windows-latest w/ install	33s
PHP 8.2 on windows-latest w/ update	32s
PHP 8.2 on macOS-latest w/ install	40s
PHP 8.2 on macOS-latest w/ update	1m 6s
PHP 8.3 on ubuntu-latest w/ install	13s
PHP 8.3 on ubuntu-latest w/ update	14s
PHP 8.3 on windows-latest w/ install	33s
PHP 8.3 on windows-latest w/ update	31s
PHP 8.3 on macOS-latest w/ install	41s
PHP 8.3 on macOS-latest w/ update	54s
PHP 8.4 on ubuntu-latest w/ install	26s
PHP 8.4 on ubuntu-latest w/ update	14s
PHP 8.4 on windows-latest w/ install	35s
PHP 8.4 on windows-latest w/ update	33s
PHP 8.4 on macOS-latest w/ install	1m 33s
PHP 8.4 on macOS-latest w/ update	44s
	10m 38s

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