Updates the Stan submodule to 9203984cf.

stan-buildbot · stan-buildbot · commit 82c51d4b973e · 2024-11-01T17:34:27.000-04:00
diff --git a/stan b/stan
@@ -1 +1 @@
-Subproject commit 3a880ada03f37b597026b8165bc9295179f6fb2a
+Subproject commit 9203984cfabf8b5fb21b897d7ae559328c2e9420
