Update phpstan/phpstan requirement from 1.11.0 to 1.11.1

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@1.11.0...1.11.1)

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

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

composer.json

@@ -10,7 +10,7 @@
     "nethergamesmc/libproxy": "dev-pm5"
   },
   "require-dev": {
-    "phpstan/phpstan": "1.11.0",
+    "phpstan/phpstan": "1.11.1",
     "pocketmine/pocketmine-mp": "^5.0.0-ALPHA7"
   },
   "repositories": [