v0.17.6

Another small update, with notable changes in NeonVM.

Features:

- neonvm: Add EmptyDisk.Discard option (#507)
  - It's opt-in, allows extra mounts to release filesystem usage on the
    host when they shrink.

Fixes:

- agent/dispatcher: Close websocket if NewDispatcher fails (#511)

Other changes:

- neonvm/runner: Add overcommit factor for CPU limits (#509)
  - Should fix some disk speed issues.
- neonvm/runner: Switch to zap for logging (#460)
  - Should help make it more clear where logs are coming from.
- pull vm-monitor from neon repository (#505)
  - completes the transition away from neondatabase/vm-monitor

Upgrade path from v0.17.5:

- Make sure all autoscaling components have been updated to v0.17.6
  before setting EmptyDisk.Discard on VMs in the cluster.