fix: upgrade pusher-js from 5.0.3 to 5.1.1 (DeviaVir#2043)

Snyk has created this PR to upgrade pusher-js from 5.0.3 to 5.1.1.

See this package in NPM:
https://www.npmjs.com/package/pusher-js

See this project in Snyk:
https://app.snyk.io/org/deviavir/project/14e19887-e219-40d4-89b6-6c657bf78942?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -92,7 +92,7 @@
     "postcss-loader": "^3.0.0",
     "progress": "^2.0.0",
     "pushbullet": "2.4.0",
-    "pusher-js": "^5.0.3",
+    "pusher-js": "^5.1.1",
     "quadrigacx": "0.0.7",
     "random-port": "^0.1.0",
     "regression": "^2.0.0",