Bump actions/upload-artifact from 4 to 5 (#83)

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Author: dependabot[bot]

.github/workflows/docs.yml

@@ -65,7 +65,7 @@ jobs:
         run: touch site/.nojekyll
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: docs-site
           path: site/