Composer 2.0: Upgrading packages and requirements

Before I'm sure this package is composer 2.0 ready, I need to update and upgrade the depending packages and system requirements.

Author: DragonBe

composer.json

@@ -25,22 +25,22 @@
         }
     },
     "require": {
-        "php": ">=7.1",
+        "php": ">=7.3",
         "ext-soap": "*",
         "ext-ctype": "*"
     },
     "require-dev": {
         "ext-pcntl": "*",
-        "phpunit/phpunit": "^7.1",
-        "phpunit/php-invoker": "^2.0",
-        "phploc/phploc": "^4.0",
+        "phpunit/phpunit": "^9.4",
+        "phpunit/php-invoker": "^3.1",
+        "phploc/phploc": "^7.0",
         "phpmd/phpmd": "^2.6",
-        "sebastian/phpcpd": "^4.0",
+        "sebastian/phpcpd": "^6.0",
         "pdepend/pdepend": "^2.5",
         "squizlabs/php_codesniffer": "^3.2",
         "phing/phing": "^2.16",
-        "infection/infection": "^0.8",
-        "sensiolabs/security-checker": "^5.0"
+        "infection/infection": "^0.20",
+        "sensiolabs/security-checker": "^6.0"
     },
     "scripts": {
         "phpcs": "phpcs",