ci: multiple dotnet versions

Author: VisualBean

.github/workflows/main.yml

@@ -37,6 +37,10 @@ jobs:
       - name: Setup .NET Core @ Latest
         if: needs.prereleaseCheck.outputs.trigger_release == 'true'
         uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: | 
+            8.0.x
+            9.0.x
 
       - name: Build ${{ matrix.package-name }} project and pack NuGet package
         if: needs.prereleaseCheck.outputs.trigger_release == 'true'