Bump socket.io-client from 2.3.0 to 2.3.1

Bumps [socket.io-client](https://github.com/Automattic/socket.io-client) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/Automattic/socket.io-client/releases)
- [Changelog](https://github.com/socketio/socket.io-client/blob/master/CHANGELOG.md)
- [Commits](socketio/socket.io-client@2.3.0...2.3.1)

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

package.json

@@ -38,7 +38,7 @@
     "mz": "^2.7.0",
     "relative-date": "^1.1.3",
     "socket.io": "^2.3.0",
-    "socket.io-client": "^2.3.0",
+    "socket.io-client": "^2.3.1",
     "vue": "2.6.12",
     "vue-router": "^3.4.5",
     "vue-server-renderer": "2.6.12",