Update dependency zeromq to ^6.0.3

Author: renovate[bot]

package-lock.json

@@ -23,7 +23,7 @@
   "homepage": "https://github.com/oxylbot/event-handler#readme",
   "dependencies": {
     "protobufjs": "^6.10.2",
-    "zeromq": "^6.0.0-beta.6"
+    "zeromq": "^6.0.3"
   },
   "devDependencies": {
     "eslint": "7.19.0",