Bump phpstan/phpstan from 1.12.7 to 2.0.0

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.12.7 to 2.0.0.
- [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...2.0.0)

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

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

composer.json

@@ -29,7 +29,7 @@
     "require-dev": {
         "php-http/message": "^1.0",
         "php-http/mock-client": "^1.0",
-        "phpstan/phpstan": "^1.5",
+        "phpstan/phpstan": "^1.5 || ^2.0",
         "phpunit/phpunit": "^9.5",
         "php-http/curl-client": "^2.2",
         "laminas/laminas-diactoros": "^2.17"