Bump ws from 6.1.2 to 6.1.3 (#5316)

Bumps [ws](https://github.com/websockets/ws) from 6.1.2 to 6.1.3.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](https://github.com/websockets/ws/compare/6.1.2...6.1.3)

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

package.json

@@ -42,7 +42,7 @@
     "uuid": "^3.1.0",
     "winston": "2.4.4",
     "winston-daily-rotate-file": "1.7.2",
-    "ws": "6.1.2"
+    "ws": "6.1.3"
   },
   "devDependencies": {
     "@babel/cli": "7.2.3",