Bump the github-actions group with 3 updates

Bumps the github-actions group with 3 updates: [actions/checkout](https://github.com/actions/checkout), [shivammathur/setup-php](https://github.com/shivammathur/setup-php) and [actions/cache](https://github.com/actions/cache).


Updates `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)

Updates `shivammathur/setup-php` from 2.9.0 to 2.31.1
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@2.9.0...2.31.1)

Updates `actions/cache` from 2 to 4
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v2...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: shivammathur/setup-php
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci.yml

@@ -11,15 +11,15 @@ jobs:
         php: ['7.4', '8.0', '8.1', '8.2', '8.3']
     name: PHP ${{ matrix.php }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Setup PHP
-      uses: shivammathur/setup-php@2.9.0
+      uses: shivammathur/setup-php@2.31.1
       with:
         php-version: ${{ matrix.php }}
         ini-values: xdebug.max_nesting_level=3000
     - name: Cache Composer packages
       id: composer-cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: "~/.composer/cache"
         key: "php-${{ matrix.php }}-composer-${{ hashFiles('**/composer.json') }}"