Bump version to 0.2.0-preview.3 #354

Job	Run time
build (macos-latest, Release)	6h 0m 20s
build (ubuntu-latest, Debug)	2m 32s
build (ubuntu-latest, Release)	2m 42s
build (windows-latest, Debug)	4m 38s
build (windows-latest, Release)	4m 44s
build (macos-latest, Debug)	1m 28s
publish-coverage	0s
	6h 16m 24s

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