Update dependency zeromq to ^6.0.3

Author: renovate[bot]

package-lock.json

@@ -21,7 +21,7 @@
     "superagent": "^6.1.0",
     "twemoji": "^13.0.1",
     "winston": "^3.3.3",
-    "zeromq": "^6.0.0-beta.6"
+    "zeromq": "^6.0.3"
   },
   "devDependencies": {
     "eslint": "7.19.0",