[build] try different URL for dotnet-install script

We are getting the error pretty early on during the build:

    Downloading dotnet-install script...
    Warning: Failed to obtain dotnet-install script size from URL 'https://dot.net/v1/dotnet-install.sh'. HTTP status code: InternalServerError (500)
      -> https://dot.net/v1/dotnet-install.sh
        downloading dotnet-install.sh

Trying a URL that will require less redirects.

build-tools/automation/yaml-templates/use-dot-net.yaml

@@ -46,7 +46,7 @@ steps:
   - bash: >
       DOTNET_ROOT=~/.dotnet/ &&
       (if [[ "${{ parameters.remove_dotnet }}" == "true" ]] ; then rm -rfv $DOTNET_ROOT; fi) &&
-      curl -L https://dot.net/v1/dotnet-install.sh --retry 5 --retry-max-time 300 > dotnet-install.sh &&
+      curl -L https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.sh --retry 5 --retry-max-time 300 > dotnet-install.sh &&
       chmod +x dotnet-install.sh &&
       ./dotnet-install.sh --channel ${{ parameters.version }} --quality ${{ parameters.quality }} --install-dir $DOTNET_ROOT --skip-non-versioned-files --verbose &&
       PATH="$DOTNET_ROOT:$PATH" &&

build-tools/xaprepare/xaprepare/ConfigAndData/Configurables.Unix.cs

@@ -15,7 +15,7 @@ partial class Defaults
 
 		partial class Urls
 		{
-			public static readonly Uri DotNetInstallScript = new Uri ("https://dot.net/v1/dotnet-install.sh");
+			public static readonly Uri DotNetInstallScript = new Uri ("https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.sh");
 		}
 	}
 }

build-tools/xaprepare/xaprepare/ConfigAndData/Configurables.Windows.cs

@@ -26,7 +26,7 @@ partial class Paths
 
 		partial class Urls
 		{
-			public static readonly Uri DotNetInstallScript = new Uri ("https://dot.net/v1/dotnet-install.ps1");
+			public static readonly Uri DotNetInstallScript = new Uri ("https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.ps1");
 		}
 	}
 }