ci: fix duplicate artifact name (#560)

Author: hi-ogawa

.github/workflows/ci-rsc.yml

@@ -67,6 +67,6 @@ jobs:
       - uses: actions/upload-artifact@v4
         if: always()
         with:
-          name: test-results-${{ matrix.os }}-${{ matrix.browser }}
+          name: test-results-${{ matrix.os }}-${{ matrix.browser }}${{ matrix.rolldown == true && '-rolldown' || '' }}
           path: |
             packages/plugin-rsc/test-results