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

Author: derrabus

composer.json

@@ -25,7 +25,7 @@
         "symfony/debug": "~2.8|~3.0|~4.0",
         "symfony/event-dispatcher": "~3.4|~4.0",
         "symfony/http-foundation": "^3.4.38|^4.3",
-        "symfony/http-kernel": "^3.4.31|^4.3.4",
+        "symfony/http-kernel": "^3.4.44|^4.3.4",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/filesystem": "~2.8|~3.0|~4.0",
         "symfony/finder": "~2.8|~3.0|~4.0",