Updates the Math submodule to 0956b10.

stan-buildbot · stan-buildbot · commit 44b3ad47bf93 · 2021-03-31T19:56:55.000-04:00
diff --git a/lib/stan_math b/lib/stan_math
@@ -1 +1 @@
-Subproject commit 40803f80dd9e3cdbcfc014b91a9a316d9618fd23
+Subproject commit 0956b106f01187a59d32dee8a7822a6a720777e1
