Fixed CI.

Author: AraHaan

.github/workflows/dotnetcore.yml

@@ -24,9 +24,7 @@ jobs:
       with:
         dotnet-version: 6.0.100-preview.2.21155.3
     - name: Restore
-      run: |
-        dotnet nuget add source "https://api.nuget.org/v3/index.json" --name "nuget.org"
-        dotnet restore
+      run: dotnet restore
       shell: bash
 
     - name: Build with dotnet