Updates the Stan submodule to d4c6ae376.

stan-buildbot · stan-buildbot · commit 7767566878c5 · 2025-03-08T06:28:10.000-05:00
diff --git a/stan b/stan
@@ -1 +1 @@
-Subproject commit e533cf77c8700ca8c4d943e205cc35c7b6cd1284
+Subproject commit d4c6ae376bba1b754b7e7cdbe9269dce93958065
