ci: use newer artifact action

ethomson · ethomson · commit c7e6c72fd773 · 2025-12-06T13:03:21.000Z
Another CI update for artifact action version.
diff --git a/.github/workflows/experimental.yml b/.github/workflows/experimental.yml
@@ -111,7 +111,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Download test results
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
     - name: Generate test summary
       uses: test-summary/action@v2
       with:
