ext: hal: nordic: Update nrfx to version 1.2.0

Updates nrfx to the recently released version containing needed
enhancements of GPIOTE and PPI HALs.

Origin: nrfx
License: BSD 3-Clause
URL: https://github.com/NordicSemiconductor/nrfx/tree/v1.2.0


commit: d19018ed334c26f0d9eb35cf7f5a622df8d54346
Purpose: Provide peripheral drivers for Nordic SoCs
Maintained-by: External

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>