Update ci.yml

Author: sdrapkin

.github/workflows/ci.yml

@@ -28,12 +28,12 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: Checkout Repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install .NET 5  
         uses: actions/setup-dotnet@v2
         with:
           dotnet-version: '5.0.x'
-      - name: Install .NET 6    
+      - name: Install .NET 6
         uses: actions/setup-dotnet@v2
         with:
           dotnet-version: '6.0.x'
@@ -45,6 +45,10 @@ jobs:
         uses: actions/setup-dotnet@v2
         with:
           dotnet-version: 8.0.x
+      - name: Install .NET 9
+        uses: actions/setup-dotnet@v2
+        with:
+          dotnet-version: 9.0.x
           include-prerelease: true
       - run: dotnet restore
       - run: dotnet build --configuration Release --no-restore