[ONOS-3707] Update env to default to Maven 3.3.9

Change-Id: If74cc04fc9f15c90511e78e23662554f41c0ecbc
diff --git a/tools/dev/onos.cshrc b/tools/dev/onos.cshrc
index e5d8e62..2fdf339 100644
--- a/tools/dev/onos.cshrc
+++ b/tools/dev/onos.cshrc
@@ -24,7 +24,7 @@
     endif
 endif
 if ( ! $?MAVEN ) then
-    setenv MAVEN $HOME/Applications/apache-maven-3.3.1
+    setenv MAVEN $HOME/Applications/apache-maven-3.3.9
 endif
 if ( ! $?KARAF_VERSION ) then
     setenv KARAF_VERSION 3.0.3