Update PHPUnit

Author: aimeos

composer.json

@@ -11,7 +11,7 @@
 	"require-dev": {
 		"squizlabs/php_codesniffer": "^3.5",
 		"php-coveralls/php-coveralls": "~2.0",
-		"phpunit/phpunit": "~7.0||~8.0||~9.0||~10.0||~11.0"
+		"phpunit/phpunit": "~7.0||~8.0||~9.0"
 	},
 	"autoload": {
 		"psr-4": {

phpunit.xml

@@ -14,4 +14,4 @@
 	<logging>
 		<log type="coverage-clover" target="coverage.xml"/>
 	</logging>
-</phpunit>
+</phpunit>