Update phpstan/phpstan requirement from ^0.12.18 to ^1.11.7

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/1.12.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@0.12.18...1.11.7)

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

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

composer.json

@@ -12,7 +12,7 @@
 		"php": ">=7.1.0"
 	},
 	"require-dev": {
-		"phpstan/phpstan": "^0.12.18",
+		"phpstan/phpstan": "^1.11.7",
 		"tracy/tracy": "^2.7",
 		"phpstan/phpstan-nette": "^0.12.6"
 	},