.NET 8 compatibility (#22461)

.github/workflows/test-packaging.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v3.2.0
         with:
-          dotnet-version: 7.0.x
+          dotnet-version: 8.0.x
 
       - name: Install dependencies
         run: dotnet restore
@@ -64,7 +64,7 @@ jobs:
 
       - name: Package client
         run: dotnet run --project Content.Packaging client --no-wipe-release
-      
+
       - name: Update Build Info
         run: Tools/gen_build_info.py