release: Bump to version 0.50.2 Round 1 (#5278) #1965

Job	Run time
build_all_features	5m 9s
build_all_platforms (ubuntu-latest)	2m 40s
build_all_platforms (macos-latest)	2m 29s
build_default_features (ubuntu-latest)	43s
build_all_platforms (windows-latest)	6m 12s
build_default_features (macos-latest)	52s
build_default_features (windows-latest)	1m 22s
build_under_wasm	1m 1s
check_clippy	4m 9s
check_msrv	32s
check_docs	3m 31s
unit	6m 47s
	35m 27s

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