Updates the Stan submodule to 5e8f86776.

stan-buildbot · stan-buildbot · commit 25636ad77784 · 2025-08-16T08:59:13.000-04:00
diff --git a/stan b/stan
@@ -1 +1 @@
-Subproject commit a6c1286cb09c782bb4aa86ed081ce3c5f34d3b83
+Subproject commit 5e8f8677681f8e7f8bacb923d5edf910933cbed7
