Bump infection/infection from 0.20.2 to 0.21.0

Bumps [infection/infection](https://github.com/infection/infection) from 0.20.2 to 0.21.0.
- [Release notes](https://github.com/infection/infection/releases)
- [Changelog](https://github.com/infection/infection/blob/master/CHANGELOG.md)
- [Commits](infection/infection@0.20.2...0.21.0)

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

Author: dependabot-preview[bot]

composer.json

@@ -20,7 +20,7 @@
         "psr/log": "^1.1"
     },
     "require-dev": {
-        "infection/infection": "^0.20",
+        "infection/infection": "^0.21",
         "laminas/laminas-diactoros": "^2.5",
         "lcobucci/coding-standard": "^6.0",
         "phpstan/extension-installer": "^1.1",