Updates the Math submodule to b916789.

stan-buildbot · stan-buildbot · commit 07585a9e5983 · 2025-10-10T04:54:55.000-04:00
diff --git a/lib/stan_math b/lib/stan_math
@@ -1 +1 @@
-Subproject commit 407dcfeb7bcdc5cbea1ff427e4945161fc47a276
+Subproject commit b9167895dbb574acd40c2d3f8dd4b5ca6fb3d418
