5.1.0

🚧 Fixes

• Fixed Stability Device Vitals: a change to the way metrics are collected in
  Bort 4.17.0 meant that operational_hours would erroneously be set to zero,
  resulting in incorrect Stability Vital charts.

📈 Improvements

• Added new screen on/off battery drain metrics:
  battery_screen_on_discharge_duration_ms, battery_screen_on_soc_pct_drop,
  battery_screen_off_discharge_duration_ms, battery_screen_off_soc_pct_drop.
  These will replace screen_off_battery_drain_%/hour/
  screen_on_battery_drain_%/hour in the future, once they are supported in the
  Memfault dashboard (to more accurately track battery drain across the fleet).