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/dependencies.yml

@@ -22,7 +22,7 @@ jobs:
         python-version: ['3.8']
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python
         uses: ./.github/actions/python-cache-requirements

.github/workflows/doc.yml

@@ -21,7 +21,7 @@ jobs:
     name: Documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/python-cache-requirements
         with:
           requirements: docs/requirements.txt

.github/workflows/lint.yml

@@ -16,15 +16,15 @@ jobs:
     name: Checking SRID in migrations files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: |
           test $(ls geotrek/*/migrations/*.py | xargs grep -l srid | xargs grep -L SRID | wc -l) -eq 0
 
   flake8:
     name: Checking Flake8 rules
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ./.github/actions/python-cache-requirements
         with:
           requirements: dev-requirements.txt