CI: run tests even with PHP 8.4 #448

Job	Run time
checks	29s
tests (7.2, prefer-lowest, ubuntu-latest)	1m 46s
tests (7.2, prefer-lowest, windows-latest)	34s
tests (7.2, prefer-stable, ubuntu-latest)	1m 45s
tests (7.2, prefer-stable, windows-latest)	38s
tests (7.3, prefer-lowest, ubuntu-latest)	1m 55s
tests (7.3, prefer-lowest, windows-latest)	37s
tests (7.3, prefer-stable, ubuntu-latest)	1m 28s
tests (7.3, prefer-stable, windows-latest)	40s
tests (7.4, prefer-lowest, ubuntu-latest)	1m 40s
tests (7.4, prefer-lowest, windows-latest)	36s
tests (7.4, prefer-stable, ubuntu-latest)	1m 54s
tests (7.4, prefer-stable, windows-latest)	31s
tests (8.0, prefer-lowest, ubuntu-latest)	1m 53s
tests (8.0, prefer-lowest, windows-latest)	40s
tests (8.0, prefer-stable, ubuntu-latest)	1m 46s
tests (8.0, prefer-stable, windows-latest)	37s
tests (8.1, prefer-lowest, ubuntu-latest)	1m 45s
tests (8.1, prefer-lowest, windows-latest)	33s
tests (8.1, prefer-stable, ubuntu-latest)	1m 15s
tests (8.1, prefer-stable, windows-latest)	34s
tests (8.2, prefer-lowest, ubuntu-latest)	10s
tests (8.2, prefer-lowest, windows-latest)	39s
tests (8.2, prefer-stable, ubuntu-latest)	12s
tests (8.2, prefer-stable, windows-latest)	33s
tests (8.3, prefer-lowest, ubuntu-latest)	10s
tests (8.3, prefer-lowest, windows-latest)	43s
tests (8.3, prefer-stable, ubuntu-latest)	11s
tests (8.3, prefer-stable, windows-latest)	38s
tests (8.4, prefer-lowest, ubuntu-latest)	12s
tests (8.4, prefer-lowest, windows-latest)	44s
tests (8.4, prefer-stable, ubuntu-latest)	11s
tests (8.4, prefer-stable, windows-latest)	36s
	28m 35s

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