ci(release): update version to 6.7.0.dev0 #3663

Job	Run time
Smoke test	6m 4s
Check format	2m 7s
Build	1m 47s
Test Intel fortran (ubuntu-22.04)	40m 44s
Extended testing (ubuntu-22.04)	1m 1s
Test GNU fortran (macos-13, false)	40m 25s
Test Intel fortran (macos-13)	31m 0s
Extended testing (macos-13)	55m 47s
Test GNU fortran (macos-14, false)	30m 34s
Test Intel fortran (windows-2022)	1h 4m 51s
Extended testing (windows-2022)	1h 58m 39s
Test GNU fortran (macos-14, true)	1h 2m 29s
Test GNU fortran (ubuntu-22.04, false)	37m 56s
Test GNU fortran (ubuntu-22.04, true)	1h 32m 0s
Test GNU fortran (windows-2022, false)	46m 45s
	10h 32m 9s

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