Use .NET 9

Author: alexeyzimarev

.github/workflows/build-dev.yml

@@ -23,11 +23,11 @@ jobs:
       -
         name: Checkout
         uses: actions/checkout@v4
-#      -  
-#        name: Setup .NET
-#        uses: actions/setup-dotnet@v3
-#        with:
-#          dotnet-version: '7.0.102'
+      -  
+        name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '9.0.x'
       -
         name: Unshallow
         run: git fetch --prune --unshallow