CI: run tests even with PHP 8.4 #444

Job	Run time
checks	29s
tests (7.2, prefer-lowest, ubuntu-latest)	1m 48s
tests (7.2, prefer-lowest, windows-latest)	31s
tests (7.2, prefer-stable, ubuntu-latest)	1m 38s
tests (7.2, prefer-stable, windows-latest)	34s
tests (7.3, prefer-lowest, ubuntu-latest)	1m 40s
tests (7.3, prefer-lowest, windows-latest)	28s
tests (7.3, prefer-stable, ubuntu-latest)	1m 47s
tests (7.3, prefer-stable, windows-latest)	25s
tests (7.4, prefer-lowest, ubuntu-latest)	1m 55s
tests (7.4, prefer-lowest, windows-latest)	31s
tests (7.4, prefer-stable, ubuntu-latest)	1m 39s
tests (7.4, prefer-stable, windows-latest)	31s
tests (8.0, prefer-lowest, ubuntu-latest)	1m 39s
tests (8.0, prefer-lowest, windows-latest)	27s
tests (8.0, prefer-stable, ubuntu-latest)	1m 41s
tests (8.0, prefer-stable, windows-latest)	23s
tests (8.1, prefer-lowest, ubuntu-latest)	1m 44s
tests (8.1, prefer-lowest, windows-latest)	31s
tests (8.1, prefer-stable, ubuntu-latest)	1m 35s
tests (8.1, prefer-stable, windows-latest)	37s
tests (8.2, prefer-lowest, ubuntu-latest)	12s
tests (8.2, prefer-lowest, windows-latest)	37s
tests (8.2, prefer-stable, ubuntu-latest)	11s
tests (8.2, prefer-stable, windows-latest)	40s
tests (8.3, prefer-lowest, ubuntu-latest)	11s
tests (8.3, prefer-lowest, windows-latest)	32s
tests (8.3, prefer-stable, ubuntu-latest)	13s
tests (8.3, prefer-stable, windows-latest)	35s
tests (8.4, prefer-lowest, ubuntu-latest)	11s
tests (8.4, prefer-lowest, windows-latest)	33s
tests (8.4, prefer-stable, ubuntu-latest)	11s
tests (8.4, prefer-stable, windows-latest)	32s
	27m 11s

Provide feedback