chore(deps): update actions/checkout digest to 3b9b8c8

Author: renovate[bot]

.github/workflows/typecheck.yaml

@@ -4,7 +4,7 @@ jobs:
    typecheck:
       runs-on: ubuntu-latest
       steps:
-         - uses: actions/checkout@2d1c1198e79c30cca5c3957b1e3b65ce95b5356e
+         - uses: actions/checkout@3b9b8c884f6b4bb4d5be2779c26374abadae0871
          - name: Setup Node.js environment
            uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d
          - run: yarn --frozen