fix(ci): setup uv in sync workflow

Author: mattwang44

.github/workflows/py313-sync-cpython.yml

@@ -30,6 +30,9 @@ jobs:
       - name: Install Dependencies
         run: sudo apt-get install gettext
 
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+
       - name: Sync with CPython
         run: make clone && make merge && make rm_cpython