CVE-2021-21368 msgpack5 4.5.1 is vulnerable, need to update to 6.0.2

[Kuilau]

(https://nvd.nist.gov/vuln/detail/CVE-2021-21368)

[dhmlau]

@Kuilau , would you like to submit a PR?

[Kuilau]

no @dhmlau I am reporting the CVE that loop-connector depends on. If your team could provide a fix that would be great. thanks.