boards: st: nucleo_g0b1re: update pyocd target

Update the pyocd runner configuration of the nucleo_g0b1re
to use the correct target.

Pyocd had issues only just after the release of the G0B1/C1 line.
This issue has already been fixed a few releases ago.

Signed-off-by: Thomas Stranger <thomas.stranger@outlook.com>