Bump phpstan/phpstan from 1.12.13 to 2.1.2 in /tools/phpstan

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.12.13 to 2.1.2.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/2.1.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.12.13...2.1.2)

---
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]

tools/phpstan/composer.json

@@ -2,7 +2,7 @@
     "name": "coduo/php-matcher-tools",
     "description": "Coduo PHP Matcher - Tools",
     "require-dev": {
-        "phpstan/phpstan": "^1.1.2"
+        "phpstan/phpstan": "^2.1.2"
     },
     "config": {
         "allow-plugins": false,