upgrade browser-tools orb from 1.5.1 to 2.4.0

Author: emilykl

.circleci/config.yml

@@ -1,6 +1,6 @@
 version: 2.1
 orbs:
-  browser-tools: circleci/browser-tools@1.5.1
+  browser-tools: circleci/browser-tools@2.4.0
 
 # Inspired by:
 # https://github.com/CircleCI-Public/circleci-demo-workflows/blob/workspace-forwarding/.circleci/config.yml