manifest: Fix psa-arch-tests manifest entry

Fix manifest entry for psa-arch-tests not set to a SHA.
Regression from: 453fbe2

Signed-off-by: Joakim Andersson <[email protected]>

Author: joerchan

west.yml

@@ -228,7 +228,7 @@ manifest:
       groups:
         - tee
     - name: psa-arch-tests
-      revision: pull/2/head
+      revision: 0aab24602cbef30f6422e7ef1066a8473073e586
       path: modules/tee/tf-m/psa-arch-tests
       groups:
         - tee