Bump actions/upload-pages-artifact from 2 to 3 (#293)

Author: dependabot[bot]

.github/workflows/publish-docs.yml

@@ -41,7 +41,7 @@ jobs:
       - name: Setup Pages
         uses: actions/configure-pages@v5
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
         with:
           # Upload entire repository
           path: './site'