(Post)Bump version: 0.6.420.0 -> 0.6.421.0 #2981

Job	Run time
macOS--mono-only	7m 6s
linux22-github--dotnet-and-newmono	3m 38s
linux22-github--dotnet-and-mono	3m 45s
linux22-vanilla--stockmono-only	4m 58s
macOS--dotnet6-and-mono	5m 23s
macOS--dotnet6-only	5m 13s
windows--dotnet6-and-legacyFramework	4m 59s
windows--dotnet6-only	8m 18s
windows--legacyFramework-only	16m 6s
linux20-github--dotnet-and-mono	3m 26s
linux22-vanilla--newmono-only	6m 38s
linux22-vanilla--stockdotnet6-and-newmono	5m 39s
linux22-vanilla--stockdotnet6-and-stockmono	4m 55s
linux22-vanilla--stockdotnet6-only	4m 45s
linux20-github--dotnet-and-newmono	3m 40s
linux20-vanilla--newmono-only	5m 19s
linux20-vanilla--stockmono-only	4m 56s
conventions	1m 17s
snap_pkg	3m 50s
	1h 43m 51s

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