improve codecov

Author: JacksonTian

.github/workflows/ci.yml

@@ -23,5 +23,7 @@ jobs:
       run: cd aliyun-net-sdk-core.Tests/ && dotnet add package AltCover --version 8.6.14 && cd ../ && dotnet restore && dotnet build
     - name: Test
       run: dotnet test aliyun-net-sdk-core.Tests/ /p:AltCover=true
-    - name: Codecov
-      run: bash <(curl -s https://codecov.io/bash) -c -F unittest
+    - name: Upload Coverage Report
+      uses: codecov/codecov-action@v4
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }} # required