setup net7 in release action

Author: cwaldren-ld

.github/actions/build-release/action.yml

@@ -11,7 +11,9 @@ runs:
     - name: Setup dotnet build tools
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 6.0
+        dotnet-version: |
+          6.0
+          7.0
 
     - name: Display dotnet version
       shell: bash