Updates the Stan submodule to 47ef60de9.

stan-buildbot · stan-buildbot · commit e45ceca604c0 · 2025-04-30T16:22:29.000-04:00
diff --git a/stan b/stan
@@ -1 +1 @@
-Subproject commit 1c10b0423ca4de08233c18b6a3b95c5f03c60e26
+Subproject commit 47ef60de9638a51aa3a98de570d4550bb70f3fac
