fix: ensure newline at end of file in deploy-docs.yml

Author: ya7010

.github/workflows/deploy-docs.yml

@@ -32,4 +32,4 @@ jobs:
       uses: peaceiris/actions-gh-pages@v3
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
-        publish_dir: ./site 
+        publish_dir: ./site