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/continuous-integration.yml

@@ -21,7 +21,7 @@ jobs:
           - {php-version: "7.4"}
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
       - name: "Setup PHP"
         uses: "shivammathur/setup-php@v2"
         with:
@@ -72,7 +72,7 @@ jobs:
           --shm-size=1g
     steps:
       - name: "Checkout plugin"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
       - name: "Get Composer cache directory"
         id: "composer-cache"
         run: |

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
         run: |
           echo "tag_name=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
       - name: "Checkout"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
       - name: "Build package"
         id: "build-package"
         uses: "glpi-project/tools/github-actions/[email protected]"