Bump yang tools version to 2.4

Change-Id: I7fada36e6ecd93d761c41ba70f057ce3a62b842b
diff --git a/tools/build/onos-buck b/tools/build/onos-buck
index f9452c8..9ebed5d 100755
--- a/tools/build/onos-buck
+++ b/tools/build/onos-buck
@@ -5,8 +5,8 @@
 
 set -e
 
-BUCK_URL="http://repo1.maven.org/maven2/org/onosproject/onos-buck/v2018.01.17.01/buck-v2018.01.17.01.zip"
-BUCK_SHA="4a70a84ef40a06762a7248db25590696e80af9fe"
+BUCK_URL="http://repo1.maven.org/maven2/org/onosproject/onos-buck/v2018.02.09.01/buck-v2018.02.09.01.zip"
+BUCK_SHA="45d8bd28f441991257babf89f7a317edb3a2b536"
 
 [  "-U" = "$1" ] && shift && FORCE_UPDATE=True