Update dependency wp-phpunit/wp-phpunit to v5.9.10

composer.json

@@ -35,7 +35,7 @@
     "vlucas/phpdotenv": "5.4.1",
     "wp-cli/db-command": "2.0.19",
     "wp-cli/i18n-command": "2.2.13",
-    "wp-phpunit/wp-phpunit": "5.8.2",
+    "wp-phpunit/wp-phpunit": "5.9.10",
     "wpeverest/wpeverest-sniffs": "0.1.2"
   },
   "scripts": {