Update phpstan/phpstan requirement from 1.9.4 to 1.9.7

Updates the requirements on [phpstan/phpstan](https://github.com/phpstan/phpstan) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.9.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.9.4...1.9.7)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
...

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

composer.json

@@ -13,7 +13,7 @@
         "ramsey/uuid": "^4.1"
     },
     "require-dev": {
-        "phpstan/phpstan": "1.9.4",
+        "phpstan/phpstan": "1.9.7",
         "phpstan/phpstan-phpunit": "^1.0.0",
         "phpstan/phpstan-strict-rules": "^1.0.0",
         "phpunit/phpunit": "^9.5"