Bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

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

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

.github/workflows/preview.yml

@@ -10,7 +10,7 @@ jobs:
   Deploy-Preview:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: errata-ai/vale-action@reviewdog
       - uses: taiki-e/install-action@v2
         with:

.github/workflows/production.yml

@@ -10,7 +10,7 @@ jobs:
   Deploy-Production:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: taiki-e/install-action@v2
         with:
           tool: zola@0.17.2