Update subsurface-libdc to 4.9.8
Changes:
- add support for the Oceanic Geo 4.0, ProPlus 4
- add support for the Scubapro Aladin A1
- add support for the Sherwood Wisdom 4
- clean up Shearwater tank pressure handling
- work around Pelagic BLE oddity (Oceanic Pro Plus X and Aqualung i770R)
- OSTC3 firmware update improvements
- minor fixlets