Update infection/infection requirement from ^0.20.1 to ^0.23.0 (#102)

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@0.20.1...0.23.0)

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

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composer.json

@@ -32,7 +32,7 @@
     },
     "require-dev": {
         "cdn77/coding-standard": "^5.0",
-        "infection/infection": "^0.20.1",
+        "infection/infection": "^0.23.0",
         "nyholm/psr7": "^1.2",
         "php-http/curl-client": "^2.1",
         "phpstan/extension-installer": "^1.1",