Update phpstan/phpstan-webmozart-assert requirement from 1.2.0 to 1.2.9

Updates the requirements on [phpstan/phpstan-webmozart-assert](https://github.com/phpstan/phpstan-webmozart-assert) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan-webmozart-assert/releases)
- [Commits](phpstan/phpstan-webmozart-assert@1.2.0...1.2.9)

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

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

composer.json

@@ -42,7 +42,7 @@
         "phpspec/phpspec": "^7.0",
         "phpstan/phpstan": "1.11.8",
         "phpstan/phpstan-phpunit": "1.4.0",
-        "phpstan/phpstan-webmozart-assert": "1.2.0",
+        "phpstan/phpstan-webmozart-assert": "1.2.9",
         "phpunit/phpunit": "^10.5",
         "rector/rector": "^1.2.2",
         "sylius-labs/coding-standard": "^4.0",