Updates the Stan submodule to ff57a3027.

stan-buildbot · stan-buildbot · commit b1781882be44 · 2025-03-22T15:24:32.000-04:00
diff --git a/stan b/stan
@@ -1 +1 @@
-Subproject commit 0c44a6dfc030a20e07e5950817046fc7526126e4
+Subproject commit ff57a3027a24df69ba3bcf358ce74dad1aa4ea61
