Bump phpstan/phpstan from 1.12.7 to 2.0.1 in /user-auth/graphtutorial

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.12.7 to 2.0.1.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/2.0.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.12.7...2.0.1)

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

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

Author: dependabot[bot]

user-auth/graphtutorial/composer.json

@@ -12,7 +12,7 @@
         "php-http/guzzle7-adapter": "^1.0"
     },
     "require-dev": {
-        "phpstan/phpstan": "^1.10"
+        "phpstan/phpstan": "^2.0"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,