fix(codecov): update codecov-upload.yml (#34845)

Update codecov upload workflow to upload artifacts from proper paths present in https://github.com/aws/aws-cdk/blob/main/codecov.yml#L35

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Author: kumvprat

.github/workflows/codecov-upload.yml

@@ -24,15 +24,15 @@ jobs:
         uses: actions/download-artifact@v4
         with:
           name: coverage-artifacts
-          path: ./coverage/packages/aws-cdk-lib/core/coverage
+          path: ./packages/aws-cdk-lib/core/coverage
           github-token: ${{ secrets.GITHUB_TOKEN }}
           repository: ${{ github.repository }}
           run-id: ${{ github.event.workflow_run.id }}
 
       - name: Upload to Codecov
         uses: codecov/codecov-action@v5
         with:
-          files: ./coverage/packages/aws-cdk-lib/core/coverage/cobertura-coverage.xml
+          files: ./packages/aws-cdk-lib/core/coverage/cobertura-coverage.xml
           fail_ci_if_error: true
           flags: suite.unit
           use_oidc: true