chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/claude.yml

@@ -25,7 +25,7 @@ jobs:
       id-token: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - uses: pnpm/action-setup@v2
         with:
           version: 10.26.2