Tiny 8-pin connector

Using Arduino General Electronics
20

MarkT:
If you want 6 or 10 pin and budget is no problem, maybe Tag-Connect? MCU/FPGA/DSP programming cables, adapters, small footprint | Tag-Connect

They are used for programming microcontrollers, so the plug/cable is expensive, but no socket
is needed, just a specific pad/hole layout on the PCB.

Those are pretty cool. I'd only need one but still kind of expensive.