Update intercom-client in analytics-plugin-intercom

[VampSlayer]

The intercom-client version for https://github.com/DavidWells/analytics/tree/master/packages/analytics-plugin-intercom, is on version 2.11.2.

On my app I'm getting a lot of dependabot issues.

Suggest(happy to contribute this) upgrading to latest version(5.0.0) https://www.npmjs.com/package/intercom-client.