Update github ci for examples

Author: Ivan Kamkin

.github/workflows/test-examples-and-snippets.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Setup latest version of dotnet
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 'latest'
+        dotnet-version: 9.x
     - name: Build nuget with latest version
       run: |
          ./scripts/pack-nuget.bash