chore(deps): update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/build.yml

@@ -9,5 +9,5 @@ jobs:
   validate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: suzuki-shunsuke/github-action-renovate-config-validator@v1.1.1