Migrate to PHPUnit 9

.gitignore

@@ -1,13 +1,6 @@
-.vagrant
-tests/Zend/Db/Table/_files/cachefiles/*
-tests/Zend/Auth/Adapter/OpenId/_files/*
-tests/Zend/Filter/_files/Compress/*
-tests/Zend/Filter/_files/Users/*
-tests/Zend/OpenId/Provider/Storage/_files/*
-tests/Zend/OpenId/_files/*
-tests/Zend/Translate/Adapter/_files/zend_cache---internal-metadatas---testid
-tests/Zend/Translate/Adapter/_files/zend_cache---testid
-tests/TestConfiguration.php
-vendor/*
-bin/dbunit
-bin/phpunit
+/.idea/
+/vendor/
+/tests/Zend/Filter/_files/Compress/*
+/tests/Zend/Filter/_files/Users/*
+/tests/Zend/Translate/Adapter/_files/zend_cache---internal-metadatas---testid
+/tests/Zend/Translate/Adapter/_files/zend_cache---testid

composer.json

@@ -24,7 +24,7 @@
         "php": ">=8.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.5",
+        "phpunit/phpunit": "@stable",
         "friendsofphp/php-cs-fixer": "@stable"
     }
 }