Increase maven stack size to 12m

Change-Id: I901fecc6aee6165ff5583a8910a78e64164834c3
diff --git a/.mvn/jvm.config b/.mvn/jvm.config
index eaac275..33df7f7 100644
--- a/.mvn/jvm.config
+++ b/.mvn/jvm.config
@@ -1 +1 @@
--Xss2m
+-Xss12m