Bump phpstan/phpstan from 1.0.2 to 1.1.1 (#4560)

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.0.2 to 1.1.1.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Commits](https://github.com/phpstan/phpstan/compare/1.0.2...1.1.1)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -38,7 +38,7 @@
       "pocketmine/spl": "^0.4.0"
    },
    "require-dev": {
-      "phpstan/phpstan": "1.0.2",
+      "phpstan/phpstan": "1.1.1",
       "phpstan/phpstan-phpunit": "^1.0.0",
       "phpstan/phpstan-strict-rules": "^1.0.0",
       "phpunit/phpunit": "^9.2"