Bump async from 2.1.4 to 2.6.4 in /cms

Bumps [async](https://github.com/caolan/async) from 2.1.4 to 2.6.4.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](caolan/async@v2.1.4...v2.6.4)

---
updated-dependencies:
- dependency-name: async
  dependency-type: direct:production
...

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

Author: dependabot[bot]

cms/package-lock.json

@@ -4,7 +4,7 @@
   "private": true,
   "dependencies": {
     "@log4js-node/rabbitmq": "^1.1.0",
-    "async": "2.1.4",
+    "async": "2.6.4",
     "braces": "^3.0.2",
     "cloudinary": "^1.18.1",
     "connect-mongo": "^3.2.0",