use uv lock check and uv sync

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: emilykl

.github/workflows/check-codegen.yml

@@ -25,7 +25,8 @@ jobs:
       run: |
         uv venv
         source .venv/bin/activate
-        uv pip install ".[dev_codegen]"
+        uv lock --check
+        uv sync --extra dev_codegen
     - name: Run codegen
       run: |
         source .venv/bin/activate