manifest: update tf-m sha

Pull in fixes needed to enable warnings being treated as errors.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

Author: nashif

west.yml

@@ -360,7 +360,7 @@ manifest:
       groups:
         - tee
     - name: trusted-firmware-m
-      revision: d38260c937f957e4617691daebc7b565e82a84c4
+      revision: 021e2bbd50c215e41710a72e05abce3224f074a7
       path: modules/tee/tf-m/trusted-firmware-m
       groups:
         - tee