Merge pull request #173 from ergebnis/dependabot/composer/infection/infection-0.15.3

composer(deps-dev): bump infection/infection from 0.13.6 to 0.15.3

Author: ergebnis-bot

composer.json

@@ -22,7 +22,7 @@
     "ergebnis/php-cs-fixer-config": "^2.2.1",
     "ergebnis/phpstan-rules": "~0.15.1",
     "ergebnis/test-util": "^1.1.0",
-    "infection/infection": "~0.13.6",
+    "infection/infection": "~0.15.3",
     "jangregor/phpstan-prophecy": "~0.8.0",
     "phpstan/extension-installer": "^1.0.4",
     "phpstan/phpstan": "~0.12.40",