Build for Qt6 by default #131

Job	Run time
build (ubuntu-22.04, Debug, static, 5.15)	1m 20s
build (ubuntu-22.04, Debug, static, 6.6.0)	1m 22s
build (ubuntu-22.04, Debug, dynamic, 5.15)	1m 21s
build (ubuntu-22.04, Debug, dynamic, 6.6.0)	1m 37s
build (ubuntu-22.04, Release, static, 5.15)	45s
build (ubuntu-22.04, Release, static, 6.6.0)	4m 1s
build (ubuntu-22.04, Release, dynamic, 5.15)	59s
build (ubuntu-22.04, Release, dynamic, 6.6.0)	58s
build (windows-2022, Debug, static, 5.15)	2m 31s
build (windows-2022, Debug, static, 6.6.0)	3m 6s
build (windows-2022, Debug, dynamic, 5.15)	3m 5s
build (windows-2022, Debug, dynamic, 6.6.0)	2m 33s
build (windows-2022, Release, static, 5.15)	1m 59s
build (windows-2022, Release, static, 6.6.0)	1m 38s
build (windows-2022, Release, dynamic, 5.15)	1m 44s
build (windows-2022, Release, dynamic, 6.6.0)	1m 20s
build (macos-13, Debug, static, 5.15)	1m 53s
build (macos-13, Debug, static, 6.6.0)	2m 43s
build (macos-13, Debug, dynamic, 5.15)	1m 23s
build (macos-13, Debug, dynamic, 6.6.0)	2m 38s
build (macos-13, Release, static, 5.15)	1m 28s
build (macos-13, Release, static, 6.6.0)	2m 11s
build (macos-13, Release, dynamic, 5.15)	1m 5s
build (macos-13, Release, dynamic, 6.6.0)	1m 34s
build (ubuntu-22.04, Release, dynamic, 6.6.0, llvm, shiboken6-generator==6.6.0 pyside6==6.6.0)	1m 43s
	46m 57s

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