health packet cleanup

[robbederks]

Field(s)	Before	After	Bytes saved	Source precision	New precision	New range
voltage_pkt	uint32_t	uint16_t	2	11 mV	11 mV	0–65.535 V
current_pkt	uint32_t	uint16_t	2	2 mA	2 mA	0–65.535 A
interrupt_load_pkt	float	uint8_t	3	≈0.0001%	≈0.392% (1/255)	0–1
temperature	float	uint8_t	3	≈0.3 °C typical	1 °C	−40–215 °C
boolean fields	Seven uint8_ts	One uint16_t bitmap	5	Boolean	Boolean	7 bits used, 9 reserved

Total 63 -> 48 bytes