ci: Bump actions/upload-pages-artifact to v4.0.0

Author: Techassi

.github/workflows/publish-docs.yml

@@ -37,7 +37,7 @@ jobs:
         run: echo '<meta http-equiv="refresh" content="0;url=stackable_operator/index.html">' > target/doc/index.html
 
       - name: Upload Documentation Artifacts
-        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3.0.1
+        uses: actions/upload-pages-artifact@7b1f4a764d45c48632c6b24a0339c27f5614fb0b # v4.0.0
         with:
           path: target/doc