Build for Qt6 by default #135

Job	Run time
build (ubuntu-22.04, Debug, static, 5.15)	5m 45s
build (ubuntu-22.04, Debug, static, 6.5.*)	5m 48s
build (ubuntu-22.04, Debug, shared, 5.15)	6m 10s
build (ubuntu-22.04, Debug, shared, 6.5.*)	6m 14s
build (ubuntu-22.04, Release, static, 5.15)	1m 28s
build (ubuntu-22.04, Release, static, 6.5.*)	1m 22s
build (ubuntu-22.04, Release, shared, 5.15)	2m 9s
build (ubuntu-22.04, Release, shared, 6.5.*)	2m 12s
build (windows-2022, Debug, static, 5.15)	5m 17s
build (windows-2022, Debug, static, 6.5.*)	4m 55s
build (windows-2022, Debug, shared, 5.15)	5m 11s
build (windows-2022, Debug, shared, 6.5.*)	5m 46s
build (windows-2022, Release, static, 5.15)	1m 41s
build (windows-2022, Release, static, 6.5.*)	2m 41s
build (windows-2022, Release, shared, 5.15)	2m 12s
build (windows-2022, Release, shared, 6.5.*)	2m 4s
build (macos-13, Debug, static, 5.15)	3m 52s
build (macos-13, Debug, static, 6.5.*)	47s
build (macos-13, Debug, shared, 5.15)	4m 54s
build (macos-13, Debug, shared, 6.5.*)	4m 12s
build (macos-13, Release, static, 5.15)	1s
build (macos-13, Release, static, 6.5.*)	1s
build (macos-13, Release, shared, 5.15)	1m 35s
build (macos-13, Release, shared, 6.5.*)	1m 58s
	1h 18m 15s

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