composer(deps-dev): bump ergebnis/test-util from 1.1.0 to 1.2.0

Bumps [ergebnis/test-util](https://github.com/ergebnis/test-util) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/ergebnis/test-util/releases)
- [Changelog](https://github.com/ergebnis/test-util/blob/main/CHANGELOG.md)
- [Commits](ergebnis/test-util@1.1.0...1.2.0)

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

composer.json

@@ -28,7 +28,7 @@
     "composer/composer": "^1.10.13 || ^2.0.0",
     "composer/package-versions-deprecated": "^1.11.99",
     "ergebnis/phpstan-rules": "~0.15.2",
-    "ergebnis/test-util": "^1.1.0",
+    "ergebnis/test-util": "^1.2.0",
     "jangregor/phpstan-prophecy": "~0.8.0",
     "phpstan/extension-installer": "^1.0.5",
     "phpstan/phpstan": "~0.12.48",