Bump phpstan/phpstan from 1.10.8 to 1.11.1

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.10.8 to 1.11.1.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.11.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.10.8...1.11.1)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

composer.json

@@ -11,7 +11,7 @@
  "nethergamesmc/quiche": "dev-master"
  },
  "require-dev": {
- "phpstan/phpstan": "1.10.8",
+ "phpstan/phpstan": "1.11.1",
  "nethergamesmc/pocketmine-mp": "dev-stable"
  },
  "repositories": [