Updates the Stan submodule to 6df13e96b.

stan-buildbot · stan-buildbot · commit cbd235be70d2 · 2024-10-08T04:33:48.000-04:00
diff --git a/stan b/stan
@@ -1 +1 @@
-Subproject commit 51dbaa4a4aa5b8d1605b3bbee43f31e297546fbf
+Subproject commit 6df13e96b7de52013325a0aca41b887833ff3cfa
