Bump the php-dev group across 1 directory with 4 updates

Bumps the php-dev group with 4 updates in the / directory: [overtrue/phplint](https://github.com/overtrue/phplint), [phpstan/phpstan-symfony](https://github.com/phpstan/phpstan-symfony), [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) and [squizlabs/php_codesniffer](https://github.com/PHPCSStandards/PHP_CodeSniffer).


Updates `overtrue/phplint` from 9.5.6 to 9.6.2
- [Release notes](https://github.com/overtrue/phplint/releases)
- [Changelog](https://github.com/overtrue/phplint/blob/main/CHANGELOG.md)
- [Commits](overtrue/phplint@9.5.6...9.6.2)

Updates `phpstan/phpstan-symfony` from 1.4.13 to 1.4.15
- [Release notes](https://github.com/phpstan/phpstan-symfony/releases)
- [Commits](phpstan/phpstan-symfony@1.4.13...1.4.15)

Updates `phpunit/phpunit` from 9.6.22 to 9.6.23
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/9.6.23/ChangeLog-9.6.md)
- [Commits](sebastianbergmann/phpunit@9.6.22...9.6.23)

Updates `squizlabs/php_codesniffer` from 3.11.3 to 3.12.2
- [Release notes](https://github.com/PHPCSStandards/PHP_CodeSniffer/releases)
- [Changelog](https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/CHANGELOG.md)
- [Commits](PHPCSStandards/PHP_CodeSniffer@3.11.3...3.12.2)

---
updated-dependencies:
- dependency-name: overtrue/phplint
  dependency-version: 9.6.2
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: php-dev
- dependency-name: phpstan/phpstan-symfony
  dependency-version: 1.4.15
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: php-dev
- dependency-name: phpunit/phpunit
  dependency-version: 9.6.23
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: php-dev
- dependency-name: squizlabs/php_codesniffer
  dependency-version: 3.12.2
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: php-dev
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]