Updates the Stan submodule to 4dc20ff68.

stan-buildbot · stan-buildbot · commit 21686368169b · 2024-11-14T17:09:14.000-05:00
diff --git a/stan b/stan
@@ -1 +1 @@
-Subproject commit 9203984cfabf8b5fb21b897d7ae559328c2e9420
+Subproject commit 4dc20ff6896faadfc9e0d3036c110390f3882a5a
