Build for Qt6 by default #130

Job	Run time
build (ubuntu-22.04, Debug, static, 5.15)	1m 11s
build (ubuntu-22.04, Debug, static, 6.6.0)	1m 29s
build (ubuntu-22.04, Debug, dynamic, 5.15)	1m 9s
build (ubuntu-22.04, Debug, dynamic, 6.6.0)	1m 27s
build (ubuntu-22.04, Release, static, 5.15)	45s
build (ubuntu-22.04, Release, static, 6.6.0)	58s
build (ubuntu-22.04, Release, dynamic, 5.15)	55s
build (ubuntu-22.04, Release, dynamic, 6.6.0)	1m 0s
build (windows-2022, Debug, static, 5.15)	2m 36s
build (windows-2022, Debug, static, 6.6.0)	2m 57s
build (windows-2022, Debug, dynamic, 5.15)	1m 50s
build (windows-2022, Debug, dynamic, 6.6.0)	3m 18s
build (windows-2022, Release, static, 5.15)	1m 2s
build (windows-2022, Release, static, 6.6.0)	1m 14s
build (windows-2022, Release, dynamic, 5.15)	1m 56s
build (windows-2022, Release, dynamic, 6.6.0)	2m 13s
build (macos-13, Debug, static, 5.15)	1m 46s
build (macos-13, Debug, static, 6.6.0)	2m 22s
build (macos-13, Debug, dynamic, 5.15)	1m 21s
build (macos-13, Debug, dynamic, 6.6.0)	2m 48s
build (macos-13, Release, static, 5.15)	52s
build (macos-13, Release, static, 6.6.0)	2m 42s
build (macos-13, Release, dynamic, 5.15)	1m 6s
build (macos-13, Release, dynamic, 6.6.0)	2m 18s
build (ubuntu-22.04, Release, dynamic, 6.6.0, llvm, shiboken6-generator==6.6.0 pyside6==6.6.0)	1m 39s
	42m 54s

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