fix: ci

Author: brunobritodev

.github/workflows/pull-request.yml

@@ -24,10 +24,10 @@ jobs:
         with:
           dotnet-version: 7.0.x
 
-      - name: Setup .NET Core 3.1
+      - name: Setup .NET Core 2.1
         uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 3.1.x
+          dotnet-version: 2.1.x
 
       - name: Restore dependencies
         run: dotnet restore