Update ci.yml

Author: ductran95

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: 7.0.x
 
     - name: Build
       run: dotnet build FastEndpoints.Extensions.sln --configuration Release