Include build on .NET 5.0.x & .NET 9.0.x

Author: abhinavminhas

.github/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         os: [ windows-2022, ubuntu-22.04, macOS-14 ]
-        dotnet-version: [ '3.1.x', '6.0.x', '7.0.x', '8.0.x' ]
+        dotnet-version: [ '3.1.x', '5.0.x', '6.0.x', '7.0.x', '8.0.x', '9.0.x' ]
 
     steps:
     - name: Checkout Repository