remove mavimo/phpstan-junit formatter (included in phpstan)

Author: mavimo

composer.json

@@ -25,7 +25,6 @@
         "chubbyphp/chubbyphp-laminas-config-factory": "^1.0",
         "chubbyphp/chubbyphp-mock": "^1.4.5",
         "infection/infection": "^0.15.3|^0.16.4",
-        "mavimo/phpstan-junit": "^0.3",
         "php-coveralls/php-coveralls": "^2.2",
         "phploc/phploc": "^5.0|^6.0.2",
         "phpstan/extension-installer": "^1.0.4",