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

Author: renovate[bot]

.github/workflows/check.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: 'actions/checkout@v5'
+        uses: 'actions/checkout@v6'
 
       - name: Install uv
         uses: 'astral-sh/setup-uv@v7'

.github/workflows/claude.yml

@@ -26,7 +26,7 @@ jobs:
       actions: read # Required for Claude to read CI results on PRs
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: 'Checkout'
-        uses: 'actions/checkout@v5'
+        uses: 'actions/checkout@v6'
 
       - name: Install uv
         uses: 'astral-sh/setup-uv@v7'