Bump src/health_manager_next:

Maria Shaldibina and Mark Rushakoff (4):
      Refactor droplet analysis
      Update varz initialization
      Test process heartbeat
      Delete droplets from registry that are not in desired state

Maria Shaldibina and Tim Labeeuw (6):
      Rename NatsBased + KnownState => ActualState
      Rename BulkApiBasedStateProvider and ExpectedStateProvider to DesiredState
      Remove the AppStateProvider parent class
      Move ActualState@set_desired_state to AppState. Rename ActualState#droplets to ActualState#app_states.
      Extract out a droplet registry from Actual State
      Rename AppState to Droplet