Add coverage for Qt 6.9 #42

Job	Run time
build (ubuntu-latest, Debug, Shared, 6.6.2, qtscxml)	3m 34s
build (ubuntu-latest, Debug, Static, 6.6.2, qtscxml)	3m 55s
build (macos-latest, Debug, Shared, 6.6.2, qtscxml)	5m 6s
build (macos-latest, Debug, Static, 6.6.2, qtscxml)	5m 20s
	17m 55s

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