Bump phpstan/phpstan from 1.10.57 to 2.1.1 in /tools

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.10.57 to 2.1.1.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/2.1.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.10.57...2.1.1)

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

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

Author: dependabot[bot]

tools/composer.json

@@ -4,7 +4,7 @@
     "require-dev": {
         "phpunit/phpunit": "^9.6.16",
         "vimeo/psalm": "^5.0",
-        "phpstan/phpstan": "^1.1.2",
+        "phpstan/phpstan": "^2.1.1",
         "infection/infection": "^0.26.0",
         "friendsofphp/php-cs-fixer": "^3.1"
     },