ci: update download-artifact

Author: krichprollsch

.github/workflows/benchmark.yml

@@ -61,7 +61,7 @@ jobs:
           echo "${{github.sha}}" > commit.txt
 
       - name: upload artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: benchmark-results
           path: |
@@ -88,7 +88,7 @@ jobs:
 
     steps:
       - name: download artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: benchmark-results