Bump version to v0.51.0-rc.3 (#5434) #2170

Job	Run time
check_docs	3m 20s
check_clippy	3m 51s
build_all_features	4m 47s
build_all_platforms (ubuntu-latest)	2m 40s
build_all_platforms (macos-latest)	2m 33s
build_default_features (ubuntu-latest)	35s
build_all_platforms (windows-latest)	7m 39s
build_default_features (macos-latest)	47s
build_default_features (windows-latest)	2m 28s
build_under_wasm	46s
check_msrv	34s
unit	6m 36s
	36m 36s

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