modules: cmsis: fix: CI with CMSIS

Update to the latest CMSIS because some modules still use CMSIS (v5.x)
which when built with the latest toolchain returns below error in CI:
`error: pac_armv81.h: No such file or directory`

Signed-off-by: Sudan Landge <sudan.landge@arm.com>

Author: wearyzen

west.yml

@@ -117,7 +117,7 @@ manifest:
       groups:
         - babblesim
     - name: cmsis
-      revision: d1b8b20b6278615b00e136374540eb1c00dcabe7
+      revision: 512cc7e895e8491696b61f7ba8066b4a182569b8
       path: modules/hal/cmsis
       groups:
         - hal