ci: drop sparse-checkout:false — it sparse-checks out only top-level files

Author: ronaldtse

.github/workflows/ci.yml

@@ -10,7 +10,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-        with: { sparse-checkout: false }
       - uses: actions/setup-node@v4
         with: { node-version: "22" }
       - run: npm install