Adjusts dotnet installation for buiddy build

Author: rossgrambo

build/install-dotnet.ps1

@@ -1,10 +1,8 @@
-# Installs .NET Core 2.1, .NET 5 and .NET 6 for CI/CD environment
+# Installs .NET 6 and .NET 7 for CI/CD environment
 # see: https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-install-script#examples
 
 [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12;
 
-&([scriptblock]::Create((Invoke-WebRequest -UseBasicParsing 'https://dot.net/v1/dotnet-install.ps1'))) -Version 2.1.816
+&([scriptblock]::Create((Invoke-WebRequest -UseBasicParsing 'https://dot.net/v1/dotnet-install.ps1'))) -Channel 6.0
 
-&([scriptblock]::Create((Invoke-WebRequest -UseBasicParsing 'https://dot.net/v1/dotnet-install.ps1'))) -Version 5.0.408
-
-&([scriptblock]::Create((Invoke-WebRequest -UseBasicParsing 'https://dot.net/v1/dotnet-install.ps1')))
+&([scriptblock]::Create((Invoke-WebRequest -UseBasicParsing 'https://dot.net/v1/dotnet-install.ps1'))) -Channel 7.0