CI: run tests even with PHP 8.4 #445

Job	Run time
checks	26s
tests (7.2, prefer-lowest, ubuntu-latest)	2m 6s
tests (7.2, prefer-lowest, windows-latest)	33s
tests (7.2, prefer-stable, ubuntu-latest)	1m 48s
tests (7.2, prefer-stable, windows-latest)	43s
tests (7.3, prefer-lowest, ubuntu-latest)	1m 20s
tests (7.3, prefer-lowest, windows-latest)	36s
tests (7.3, prefer-stable, ubuntu-latest)	1m 53s
tests (7.3, prefer-stable, windows-latest)	33s
tests (7.4, prefer-lowest, ubuntu-latest)	1m 40s
tests (7.4, prefer-lowest, windows-latest)	35s
tests (7.4, prefer-stable, ubuntu-latest)	1m 27s
tests (7.4, prefer-stable, windows-latest)	34s
tests (8.0, prefer-lowest, ubuntu-latest)	1m 56s
tests (8.0, prefer-lowest, windows-latest)	37s
tests (8.0, prefer-stable, ubuntu-latest)	1m 39s
tests (8.0, prefer-stable, windows-latest)	32s
tests (8.1, prefer-lowest, ubuntu-latest)	1m 17s
tests (8.1, prefer-lowest, windows-latest)	33s
tests (8.1, prefer-stable, ubuntu-latest)	1m 40s
tests (8.1, prefer-stable, windows-latest)	34s
tests (8.2, prefer-lowest, ubuntu-latest)	11s
tests (8.2, prefer-lowest, windows-latest)	36s
tests (8.2, prefer-stable, ubuntu-latest)	11s
tests (8.2, prefer-stable, windows-latest)	40s
tests (8.3, prefer-lowest, ubuntu-latest)	10s
tests (8.3, prefer-lowest, windows-latest)	34s
tests (8.3, prefer-stable, ubuntu-latest)	10s
tests (8.3, prefer-stable, windows-latest)	38s
tests (8.4, prefer-lowest, ubuntu-latest)	14s
tests (8.4, prefer-lowest, windows-latest)	31s
tests (8.4, prefer-stable, ubuntu-latest)	17s
tests (8.4, prefer-stable, windows-latest)	33s
	27m 47s

Provide feedback