Bump actions/checkout from 2 to 4 (#11)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/continuous-integration.yml

@@ -30,7 +30,7 @@ jobs:
             os: windows-latest
 
     steps:
-      - uses: "actions/checkout@v2"
+      - uses: "actions/checkout@v4"
 
       - uses: "shivammathur/setup-php@v2"
         with:

.github/workflows/lint.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: "actions/checkout@v4"
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"

.github/workflows/phpstan.yml

@@ -20,7 +20,7 @@ jobs:
           - "8.3"
 
     steps:
-      - uses: "actions/checkout@v2"
+      - uses: "actions/checkout@v4"
 
       - uses: "shivammathur/setup-php@v2"
         with: