build: remove behat dependencies

Author: Greg Bowler

composer.json

@@ -32,10 +32,7 @@
 
 	"require-dev": {
 		"phpstan/phpstan": "~1.1",
-		"phpunit/phpunit": "~9.5",
-		"behat/behat": "~3.3",
-		"behat/mink-extension": "~2.3",
-		"behat/mink-goutte-driver": "~1.3"
+		"phpunit/phpunit": "~9.5"
 	},
 
 	"autoload": {