Make dotnet install detection only care about the dotnet channel.

Author: NogginBops

build/build.fs

@@ -105,7 +105,7 @@ let ciTestProjects =
 let install =
     lazy
         (if (DotNet.getVersion id).StartsWith "6" then id
-         else DotNet.install (fun options -> { options with Version = DotNet.Version "6.0.200" }))
+         else DotNet.install (fun options -> { options with Channel = DotNet.CliChannel.Version 6 0 }))
 
 // Define general properties across various commands (with arguments)
 let inline withWorkDir wd = DotNet.Options.lift install.Value >> DotNet.Options.withWorkingDirectory wd