Update sbt-ci-release to 1.6.0 #461

Job	Run time
build (ubuntu-latest)	6m 50s
build (macos-latest)	22m 17s
scripted (ubuntu-latest, 1.2.8)	7m 38s
scripted (ubuntu-latest, 1.3.13)	6m 10s
build (windows-latest)	8m 12s
scripted (ubuntu-latest, project)	6m 1s
scripted (macos-latest, 1.2.8)	27m 33s
scripted (macos-latest, 1.3.13)	27m 29s
scripted (macos-latest, project)	22m 29s
scripted (windows-latest, 1.2.8)	9m 27s
scripted (windows-latest, 1.3.13)	8m 3s
scripted (windows-latest, project)	7m 40s
ci-passed	1s
	2h 39m 50s

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