chore: prevent prefer-lowest tests from failing due to PHPUnit 10 deprecations

Author: jordyvanderhaegen

composer.json

@@ -21,7 +21,7 @@
     },
     "require-dev": {
         "orchestra/testbench-browser-kit": "^8.5|^9.0",
-        "phpunit/phpunit": "^10.0"
+        "phpunit/phpunit": "^9.5.10|^10.0"
     },
     "suggest": {
         "ext-intl": "*"