Bump to development version. #171

Job	Run time
Check windows-latest (release)	5m 7s
Check macOS-latest (release)	2m 58s
Check ubuntu-latest (release)	9m 53s
Check ubuntu-20.04 (4.0)	6m 4s
Check ubuntu-latest (devel)	18m 5s
	42m 7s

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