Bump pubsub-js from 1.9.2 to 1.9.3

Bumps [pubsub-js](https://github.com/mroderick/PubSubJS) from 1.9.2 to 1.9.3.
- [Release notes](https://github.com/mroderick/PubSubJS/releases)
- [Changelog](https://github.com/mroderick/PubSubJS/blob/master/CHANGES.md)
- [Commits](mroderick/PubSubJS@v1.9.2...v1.9.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package.json

@@ -64,7 +64,7 @@
     "pepjs": "0.5.3",
     "picturefill": "3.0.3",
     "popper.js": "1.16.1",
-    "pubsub-js": "1.9.2",
+    "pubsub-js": "1.9.3",
     "quill": "1.3.7",
     "respond.js": "1.4.2",
     "responsive-tabs": "1.6.3",

yarn.lock

@@ -4915,10 +4915,10 @@ psl@^1.1.28:
   resolved "https://registry.yarnpkg.com/psl/-/psl-1.8.0.tgz#9326f8bcfb013adcc005fdff056acce020e51c24"
   integrity sha512-RIdOzyoavK+hA18OGGWDqUTsCLhtA7IcZ/6NCs4fFJaHBDab+pDDmDIByWFRQJq2Cd7r1OoQxBGKOaztq+hjIQ==
 
-pubsub-js@1.9.2:
-  version "1.9.2"
-  resolved "https://registry.yarnpkg.com/pubsub-js/-/pubsub-js-1.9.2.tgz#4d01fe4df7d1957efa681f6338ebc9ba11b7ef3a"
-  integrity sha512-t+djzDvEKv4GoP5nPJ5Ar5h+4MrwPw+C9/9l75GV8TzO49HezXnxR1G6E/QJZdE2EDsXRNMu6O9MFjpjkSV7zg==
+pubsub-js@1.9.3:
+  version "1.9.3"
+  resolved "https://registry.yarnpkg.com/pubsub-js/-/pubsub-js-1.9.3.tgz#674eea4d568d0402e0527cdb10e2aab7b55621d2"
+  integrity sha512-FhYYlPNOywTh7zN38u5AlG67emA47w6JZd7YgdQU1w8gQbZhhIGxVM0AQosdaINHb2ALb+fhfnVyBJAt4D4IzA==
 
 pump@^2.0.0:
   version "2.0.1"