Updates the Stan submodule to 6d0d863b9.

stan-buildbot · stan-buildbot · commit 92f39f07d268 · 2025-04-25T18:06:26.000-04:00
diff --git a/stan b/stan
@@ -1 +1 @@
-Subproject commit 8a21c1287e7754ab02b610ac63c5288f06f1406c
+Subproject commit 6d0d863b93c7c34dfec4b013863678b233dc9fc7
