Update msm from develop

boost-commitbot · boost-commitbot · commit cb53e0d12ade · 2025-12-18T16:48:23.000Z
diff --git a/libs/msm b/libs/msm
@@ -1 +1 @@
-Subproject commit b2fcce38be770899e44bfd455b63ee57c901e636
+Subproject commit 21d1b93b9c86669f956191944f73a8b9f270adb3
