modules: hal_nordic: bump regtool to 9.1.0

Changes for this package version:

* CTRLSEL is now set appropriately for the SPIS121 pins.
* DPPI.LINK configuration is now skipped when processing
  the 'dppic130' devicetree node.

Signed-off-by: Jonathan Nilsen <jonathan.nilsen@nordicsemi.no>
1 file changed