ci(deps): 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] <support@github.com>

.github/workflows/django-tests.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         python-version: ["3.11", "3.12"]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v3
       with:

.github/workflows/js-beautify.yml

@@ -9,7 +9,7 @@ jobs:
   jsbeautify:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       # for poetry caching, we have to install poetry before setting up python
       - name: Install poetry
         run: pipx install poetry

.github/workflows/pages.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-     - uses: actions/checkout@v3
+     - uses: actions/checkout@v4
      - uses: actions/setup-python@v3
      - name: Install documentation dependencies
        run: |
@@ -32,7 +32,7 @@ jobs:
        run: |
          poetry run coverage run --source="." manage.py test
          poetry run coverage html
-     - uses: actions/checkout@v3
+     - uses: actions/checkout@v4
        with:
          path: apis-core-rdf-pages
          ref: pages