build(deps-dev): bump phpstan/phpstan from 1.5.3 to 1.5.4
build(deps-dev): bump phpstan/phpstan from 1.5.3 to 1.5.4

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.5.3 to 1.5.4.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.6.x/CHANGELOG.md)
- [Commits](https://github.com/phpstan/phpstan/compare/1.5.3...1.5.4)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
editorconfig-checker/editorconfig-checker.php,editorconfig-checker/editorconfig-checker.php