Update phpstan/phpstan requirement from 1.4.0 to 1.4.2 (#41)

Updates the requirements on [phpstan/phpstan](https://github.com/phpstan/phpstan) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/master/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.4.0...1.4.2)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
...

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

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

composer.json

@@ -35,7 +35,7 @@
         "jangregor/phpstan-prophecy": "^1",
         "mikey179/vfsstream": "^1.6.7",
         "phpstan/extension-installer": "^1.1",
-        "phpstan/phpstan": "1.4.0",
+        "phpstan/phpstan": "1.4.2",
         "phpstan/phpstan-symfony": "^1",
         "phpunit/phpunit": "^9.5"
     },