Use solution file instead of packages.config

Author: ProgramMax

.github/workflows/build-and-test.yaml

@@ -26,7 +26,7 @@ jobs:
       uses: microsoft/[email protected]
 
     - name: Update NuGet packages
-      run: nuget update .\Projects\VisualStudio\maxGUI\packages.config
+      run: nuget update .\Projects\VisualStudio\maxGUI.sln
 
     - name: Build
       working-directory: ${{env.GITHUB_WORKSPACE}}