ci: update GitHub Actions workflow to use uv for Sphinx build command

Author: AdithyaSireesh

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Install the project
         run: uv sync
       - name: Build HTML
-        run: sphinx-build -b html docs/source docs/_build/html
+        run: uv run sphinx-build -b html docs/source docs/_build/html
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
         with: