Merge pull request #59 from kenjis/update-phpunit

[4.x] chore: update PHPUnit to 9.5

Author: kenjis

composer.json

@@ -16,12 +16,12 @@
         }
     ],
     "require": {
-        "php": ">=7.2.0",
+        "php": ">=7.3.0",
         "twig/twig": "^3.1.1"
     },
     "require-dev": {
         "codeigniter4/framework": "^4.0.4",
-        "phpunit/phpunit": "^8.5"
+        "phpunit/phpunit": "^9.5"
     },
     "autoload": {
         "psr-4": {