Upgrade PHPUnit to 8.5 (php 7.2) and 9.3 (php >= 7.3).

Author: derrabus

composer.json

@@ -26,7 +26,7 @@
     },
     "require-dev": {
         "doctrine/collections": "~1.0",
-        "symfony/validator": "^3.4.3|^4.0.3",
+        "symfony/validator": "^3.4.44|^4.0.3",
         "symfony/dependency-injection": "~3.3|~4.0",
         "symfony/config": "~2.7|~3.0|~4.0",
         "symfony/expression-language": "~3.4|~4.0",