Bump dotnet sdk from 6.0.418 to 6.0.419 #637

Job	Run time
build (macos-latest)	45s
lint-markdown	12s
build (ubuntu-latest)	43s
build (windows-latest)	2m 47s
integration (macos-latest, default)	1m 27s
integration (macos-latest, bash)	1m 23s
integration (macos-latest, pwsh)	1m 11s
integration (ubuntu-latest, default)	42s
integration (ubuntu-latest, bash)	47s
integration (ubuntu-latest, pwsh)	48s
integration (windows-latest, default)	2m 35s
integration (windows-latest, pwsh)	2m 36s
integration (windows-latest, C:\Program Files\Git\bin\bash.exe)	2m 34s
release	0s
	18m 30s

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