lock to phpunit 9.5.24

Author: leonstafford

composer.json

@@ -35,7 +35,7 @@
         "thecodingmachine/phpstan-strict-rules": "*",
         "szepeviktor/phpstan-wordpress": "*",
         "squizlabs/php_codesniffer": "*",
-        "phpunit/phpunit": "*",
+        "phpunit/phpunit": "9.5.24",
         "dealerdirect/phpcodesniffer-composer-installer": "*",
         "wp-coding-standards/wpcs": "*",
         "phpcompatibility/php-compatibility": "*",