Bump actions/checkout from 3 to 4 (#391)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/check-links.yml

@@ -15,12 +15,12 @@ jobs:
 
     steps:
     - name: Checkout the repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         path: repository
 
     - name: Checkout the website
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: gh-pages
         path: website

.github/workflows/deploy.yml

@@ -17,7 +17,7 @@ jobs:
         uses: styfle/[email protected]
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Hugo
         uses: peaceiris/[email protected]

.github/workflows/preview-pr.yml

@@ -14,7 +14,7 @@ jobs:
         uses: styfle/[email protected]
 
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Hugo
         uses: peaceiris/[email protected]