move to official php8.4 image for unit testing in CI #554

Job	Run time
Tests (ubuntu-latest, 7.2, default)	1m 20s
Tests (ubuntu-latest, 7.3, default)	1m 15s
Tests (ubuntu-latest, 7.4, default)	1m 14s
Tests (ubuntu-latest, 8.0, default)	1m 16s
Tests (ubuntu-latest, 8.1, default)	1m 23s
Tests (ubuntu-latest, 8.2, default)	1m 20s
Tests (ubuntu-latest, 8.3, default)	1m 23s
Tests (ubuntu-latest, 8.4, default)	1m 15s
Tests (windows-latest, 7.2, default)	1m 42s
Tests (windows-latest, 7.3, default)	1m 44s
Tests (windows-latest, 7.4, default)	1m 44s
Tests (windows-latest, 8.0, default)	1m 45s
Tests (windows-latest, 8.1, default)	1m 43s
Tests (windows-latest, 8.2, default)	1m 50s
Tests (windows-latest, 8.3, default)	1m 45s
Tests (windows-latest, 8.4, default)	1m 51s
Tests (ubuntu-latest, 8.0, jit)	1m 16s
Tests (ubuntu-latest, 8.1, jit)	1m 35s
Tests (ubuntu-latest, 8.2, jit)	1m 16s
Tests (ubuntu-latest, 8.3, jit)	1m 15s
Tests (ubuntu-latest, 8.4, jit)	1m 23s
	31m 15s

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