Updates the Stan submodule to c9547d30a.

stan-buildbot · stan-buildbot · commit 98b4e01f6f2a · 2025-05-10T06:41:45.000-04:00
diff --git a/stan b/stan
@@ -1 +1 @@
-Subproject commit 47ef60de9638a51aa3a98de570d4550bb70f3fac
+Subproject commit c9547d30a29d36e9786a816b4ae6ebb1478af91b
