chore(deps): actions/checkout action to v6 (#6)

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

Author: renovate[bot]

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
       image: node:24
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: pnpm setup
         uses: pnpm/action-setup@v4
         with:

.github/workflows/pr-title-check.yml

@@ -9,7 +9,7 @@ jobs:
       image: node:24
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Run PR title check
         run: |
           node .github/scripts/pr-title-check.js