Bump fullyconnect operation version to 12.
Bump fullyconnect operation version to 12.

`quantized_bias_type`: this will determine the default value for quantize bias. Not relevant for GPU, since all operations are in floating-point.

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/12979 from Tixxx:tixxx/pgle_send 469b2d31ff6b0270dda28f8754462681514d0e04
