composer(deps-dev): update infection/infection requirement

Updates the requirements on [infection/infection](https://github.com/infection/infection) to permit the latest version.
- [Release notes](https://github.com/infection/infection/releases)
- [Changelog](https://github.com/infection/infection/blob/master/CHANGELOG.md)
- [Commits](infection/infection@0.29.11...0.29.12)

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

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

composer.json

@@ -30,7 +30,7 @@
     "ext-tokenizer": "*",
     "ext-xml": "*",
     "ext-xmlwriter": "*",
-    "infection/infection": "^0.29.11",
+    "infection/infection": "^0.29.12",
     "mimmi20/coding-standard": "^6.0.10",
     "nikic/php-parser": "^5.4.0",
     "phpstan/extension-installer": "^1.4.3",