Bump actions/checkout from 3 to 4

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]>

.github/workflows/hugo.yml

@@ -41,7 +41,7 @@ jobs:
       - name: Install Dart Sass Embedded
         run: sudo snap install dart-sass-embedded
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: recursive
           fetch-depth: 0

.github/workflows/lighthouse.yml

@@ -4,7 +4,7 @@ jobs:
   lighthouse:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Audit URLs using Lighthouse
         uses: treosh/lighthouse-ci-action@v10
         with:

.github/workflows/linter.yml

@@ -10,7 +10,7 @@ jobs:
   lint_markdown:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with: