Drop support of PHPUnit v7 dependency

composer.json

@@ -43,7 +43,7 @@
         "php-cs-fixer/phpunit-constraint-xmlmatchesxsd": "^1.2.1",
         "phpspec/prophecy": "^1.10.3",
         "phpspec/prophecy-phpunit": "^1.1 || ^2.0",
-        "phpunit/phpunit": "^7.5.20 || ^8.5.14 || ^9.5",
+        "phpunit/phpunit": "^8.5.21 || ^9.5",
         "phpunitgoodpractices/polyfill": "^1.5",
         "phpunitgoodpractices/traits": "^1.9.1",
         "symfony/phpunit-bridge": "^5.2.4",