Updates the Stan submodule to 1bbf73552.

stan-buildbot · stan-buildbot · commit 134e5e8ca66d · 2024-05-13T10:45:45.000-04:00
diff --git a/stan b/stan
@@ -1 +1 @@
-Subproject commit bef9c85db40013918b23602153432e2ecd7d0e94
+Subproject commit 1bbf73552306aae70842aeab97b44a7b2ecdca37
