Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yaml

@@ -11,7 +11,7 @@ jobs:
     name: Type Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: oven-sh/[email protected]
         with:
           bun-version: 1.3.2