Bump actions/checkout from 3 to 4 (#77)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
   lint:
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setup PHP
       uses: shivammathur/setup-php@2.26.0
       with:
@@ -29,7 +29,7 @@ jobs:
       matrix:
         php-versions: ['8.1', '8.2']
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setup PHP
       uses: shivammathur/setup-php@2.26.0
       with:
@@ -49,7 +49,7 @@ jobs:
       matrix:
         php-versions: ['8.1', '8.2']
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setup PHP
       uses: shivammathur/setup-php@2.26.0
       with: