Bump actions/download-artifact from 4 to 5 (#268)

Author: dependabot[bot]

.github/workflows/test.yml

@@ -90,7 +90,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Download coverage artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v5
 
       - name: Codecov upload
         uses: codecov/codecov-action@v5