build(deps-dev): update phpstan/phpstan requirement (#646)

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/1.11.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.10.46...1.10.50)

---
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

@@ -33,7 +33,7 @@
 		"nette/tester": "~2.5",
 		"mockery/mockery": ">=1.5.1",
 		"phpstan/extension-installer": "1.3.1",
-		"phpstan/phpstan": "1.10.46",
+		"phpstan/phpstan": "1.10.50",
 		"phpstan/phpstan-deprecation-rules": "1.1.4",
 		"phpstan/phpstan-nette": "1.2.9",
 		"phpstan/phpstan-mockery": "1.1.1",