fix: simplify dependency installation in deploy-docs.yml

Author: ya7010

.github/workflows/deploy-docs.yml

@@ -22,8 +22,7 @@ jobs:
         
     - name: Install dependencies
       run: |
-        uv pip install --system .
-        uv pip install --system ".[docs]"
+        uv sync
         
     - name: Build documentation
       run: uv run task docs-build