build(deps): bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/deploy.yaml

@@ -17,7 +17,7 @@ jobs:
         stage: ["commit", "push"]
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
       - name: Agent doc lint (changed files)
@@ -131,7 +131,7 @@ jobs:
         stage: ["manual"]
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0
       - name: pre-commit check-external-links
@@ -192,12 +192,12 @@ jobs:
       contents: read
     steps:
       - name: Checkout template
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           token: "${{ secrets.PRIVATE_REPO_TOKEN }}"
           repository: "radxa-docs/docs-template"
       - name: Checkout contents
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           path: "contents"
       - name: Install dependencies