Updates the Stan submodule to e905c505d.

stan-buildbot · stan-buildbot · commit 68cbd5a3606f · 2026-02-15T09:22:47.000-05:00
diff --git a/StanHeaders/inst/include/upstream b/StanHeaders/inst/include/upstream
@@ -1 +1 @@
-Subproject commit a78a30eca98e80307ff453e37dfb4b3028ec2fd9
+Subproject commit e905c505da660bfa2b2b80420f22d8dc3bf92e8d
