build(deps-dev): update phpstan/phpstan requirement from 1.4.2 to 1.4.4

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@1.4.2...1.4.4)

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

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

composer.json

@@ -24,7 +24,7 @@
 		"nette/finder": "~2.5",
 		"nette/neon": "~3.0",
 		"phpstan/extension-installer": "1.1.0",
-		"phpstan/phpstan": "1.4.2",
+		"phpstan/phpstan": "1.4.4",
 		"phpstan/phpstan-deprecation-rules": "1.0.0",
 		"phpstan/phpstan-strict-rules": "1.1.0",
 		"symfony/config": "~4.4 || ~5.0",