Updates the Math submodule to b4fda80237.

stan-buildbot · stan-buildbot · commit 649efe2d75c1 · 2026-05-19T10:05:20.000-04:00
diff --git a/lib/stan_math b/lib/stan_math
@@ -1 +1 @@
-Subproject commit 9061cec991fe8ad9ba0fa8da569ddb704cde4b2f
+Subproject commit b4fda80237d989b9227a27b9afbc656ae398bca9
