Update release-build.yml

Author: sumesh-pu-swg

.github/workflows/release-build.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Ensure .NET Installed
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: 9.0.x
 
     - name: Install GitVersion
       uses: gittools/actions/gitversion/[email protected]