chore(gha): bump actions/download-artifact from 7 to 8 (#3482)

Author: dependabot[bot]

.github/workflows/generate-documentation.yml

@@ -72,7 +72,7 @@ jobs:
       contents: write # Push to gh-pages
     steps:
       - name: Download
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: documentation-${{github.sha}}
       - name: Push to gh-pages