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]>

.github/workflows/generate-and-publish.yml

@@ -33,7 +33,7 @@ jobs:
     if: github.ref == 'refs/heads/master'
     steps:
     - name: Download generated website
-      uses: actions/download-artifact@v2
+      uses: actions/download-artifact@v4.1.7
       with:
         name: public
         path: _public
@@ -57,7 +57,7 @@ jobs:
     if: github.ref != 'refs/heads/master'
     steps:
     - name: Download generated website
-      uses: actions/download-artifact@v2
+      uses: actions/download-artifact@v4.1.7
       with:
         name: public
         path: _public