[#68373322] update agents to latest releases, version bump

For at least the last few days, we've been receiving incessant PagerDuty alerts due to chef run failures. The root cause for nearly all of them have been because the MMS agents (monitoring and backup) are older than the released versions, and they do not appear to keep older versions downloadable. The `.deb` debian installer package that's been downloaded as part of this recipe is just an empty file, which obviously breaks because it's not installable.

This is yet another instance where we're getting bitten by something we don't own, so the next time this happens I'll probably stick it into S3 so we can update on our own schedule.