Increment version to 2.12.0-SNAPSHOT (#996) #2575

Job	Run time
test-and-build (11, ubuntu-latest, ism)	24m 43s
test-and-build (11, ubuntu-latest, non-ism)	14m 18s
test-and-build (11, windows-latest, ism)	6m 28s
test-and-build (11, windows-latest, non-ism)	6m 24s
test-and-build (11, macos-latest, ism)	4m 27s
test-and-build (11, macos-latest, non-ism)	6m 19s
test-and-build (17, ubuntu-latest, ism)	23m 15s
test-and-build (17, ubuntu-latest, non-ism)	15m 57s
test-and-build (17, windows-latest, ism)	6m 48s
test-and-build (17, windows-latest, non-ism)	7m 10s
test-and-build (17, macos-latest, ism)	6m 17s
test-and-build (17, macos-latest, non-ism)	6m 29s
	2h 8m 35s

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