west.yml: Update st revision

st: update to latest ST package revision '44d5d70'.

Includes ST S2LP Library.

Signed-off-by: Nikos Oikonomou <nikoikonomou92@gmail.com>

Author: nikooiko

west.yml

@@ -69,7 +69,7 @@ manifest:
       revision: be39d4eebeddac6e18e9c0c3ba1b31ad1e82eaed
       path: modules/hal/silabs
     - name: hal_st
-      revision: b52fdbf4b62439be9fab9bb4bae9690a42d2fb14
+      revision: pull/6/head
       path: modules/hal/st
     - name: hal_stm32
       revision: 50283e0438d882a80fb681907664491c7042c817