Don't update the csproj version if no updates were found; Fix Window'… #100

Job	Run time
Build Sodium for android-arm64	26s
Build Sodium for linux-x64	18s
Build Sodium for linux-musl-x64	10s
Build Sodium for linux-arm64	15s
Build Sodium for linux-musl-arm64	18s
Build Sodium for osx-x64	21s
Build Sodium for osx-arm64	22s
Build Sodium for ios-arm64	20s
Build Sodium for win-x86	2m 8s
Build Sodium for win-x64	2m 36s
Build Sodium for win-arm64	2m 0s
Update .NET project version	7s
	9m 21s

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