Update PHPUnit

Author: renovate[bot]

composer.json

@@ -13,13 +13,13 @@
  "ergebnis/composer-normalize": "^2.47.0",
  "ergebnis/phpunit-slow-test-detector": "^2.19.1",
  "icanhazstring/composer-unused": "^0.9.4",
- "infection/infection": "^0.29.14",
+ "infection/infection": "^0.31.1",
  "maglnet/composer-require-checker": "^4.16.1",
  "mockery/mockery": "^1.6.12",
  "php-parallel-lint/php-console-highlighter": "^1.0",
  "php-parallel-lint/php-parallel-lint": "^1.4.0",
  "phpstan/phpstan": "^2.1.21",
- "phpunit/phpunit": "^12.2.2",
+ "phpunit/phpunit": "^12.3.0",
  "rector/rector": "^2.1.2",
  "roave/backward-compatibility-check": "^8.14.0",
  "squizlabs/php_codesniffer": "^3.13.2",