Bump phpstan/phpstan from 1.11.11 to 1.12.0

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.11.11 to 1.12.0.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.12.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.11.11...1.12.0)

---
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

@@ -7,7 +7,7 @@
     "php": "^8.0"
   },
   "require-dev": {
-    "phpstan/phpstan": "1.11.11",
+    "phpstan/phpstan": "1.12.0",
     "pocketmine/pocketmine-mp": "dev-stable"
   },
   "autoload": {