Update main.yml

Author: mxr

.github/workflows/main.yml

@@ -18,6 +18,7 @@ jobs:
   ruff:
     runs-on: ubuntu-latest
     steps:
+    - uses: asottile/workflows/.github/actions/fast-checkout@v1.8.1
     - uses: astral-sh/ruff-action@v3
     - run: ruff check --fix
     - run: ruff format