chore(deps): update actions/checkout digest to b4ffde6 (#200)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -31,7 +31,7 @@ jobs:
         run: |
           echo '${{ toJson(env) }}'
       - name: コードをチェックアウトする
-        uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 # v4
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Node.js のセットアップを行う
         uses: actions/setup-node@v3
         with: