Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build-site.yml

@@ -69,7 +69,7 @@ jobs:
 
     steps:
       - name: "Download Generated Site"
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4.1.7
         with:
           name: generated_site
           path: generated_site