[nrf fromtree] manifest: Update nRF hw models to latest

Update the HW models module to:
6e5961223f81aa2707c555db138819a5c1b7942c

Including the following:
6e59612 CLOCK (52,53): Fix test interface with multiple instances
ecf2292 54 CRACEN: Improve model
1277b16 irq controller: Remove out of date comment

Signed-off-by: Alberto Escolar Piedras <[email protected]>
(cherry picked from commit e1c37f6)
Signed-off-by: Rubin Gerritsen <[email protected]>

Author: aescolar

west.yml

@@ -325,7 +325,7 @@ manifest:
       groups:
         - tools
     - name: nrf_hw_models
-      revision: 968d55ff22579080466bf2f482596dd6e35361c6
+      revision: 6e5961223f81aa2707c555db138819a5c1b7942c
       path: modules/bsim_hw_models/nrf_hw_models
     - name: nrf_wifi
       revision: 787eea1a3c8dd13c86214e204a919e6f9bcebf91