Update dotnet-build.yml

.github/workflows/dotnet-build.yml

@@ -15,6 +15,7 @@ jobs:
     - uses: actions/checkout@v3
       with:
         fetch-depth: 0 # avoid shallow clone so nbgv can do its work.
+        submodules: true
     - name: Add msbuild to PATH
       uses: microsoft/[email protected]
       with: