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

.github/workflows/ci.yaml

@@ -16,7 +16,7 @@ jobs:
       contents: read
       pull-requests: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install pnpm
         uses: pnpm/action-setup@v4

.github/workflows/publish.yaml

@@ -13,7 +13,7 @@ jobs:
     name: Check version changes and publish
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0