Update build.yaml

Author: MKMonkeyCat

.github/workflows/build.yaml

@@ -30,9 +30,6 @@ jobs:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
     steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-
       - name: Generate out
         uses: ./.github/workflows/generate.yaml