Bump version to 10.7.0.0a9 #1774

Job	Run time
build (windows-debug-platform25)	21m 43s
build (macos-arm64-platform25)	10m 15s
build (linux-platform24)	18m 49s
build (linux-platform25)	17m 43s
build (linux-debug-platform25)	19m 29s
build (windows-platform25)	27m 14s
	1h 55m 13s

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