Bumping dependency on YANG tools 1.12.0-b6

Change-Id: I10572f437aa8553594c3c5381c53aebcc9ecb23f
diff --git a/lib/deps.json b/lib/deps.json
index 8129dd6..172b80e 100644
--- a/lib/deps.json
+++ b/lib/deps.json
@@ -210,9 +210,9 @@
     "onos-yang-datamodel": "mvn:org.onosproject:onos-yang-datamodel:1.11",
     "onos-yang-maven-plugin": "mvn:org.onosproject:onos-yang-maven-plugin:1.11",
     "onos-yang-utils-generator": "mvn:org.onosproject:onos-yang-utils-generator:1.11",
-    "onos-yang-model":"mvn:org.onosproject:onos-yang-model:1.12.0-b5",
-    "onos-yang-compiler-api":"mvn:org.onosproject:onos-yang-compiler-api:1.12.0-b5",
-    "onos-yang-runtime":"mvn:org.onosproject:onos-yang-runtime:1.12.0-b5",
+    "onos-yang-model":"mvn:org.onosproject:onos-yang-model:1.12.0-b6",
+    "onos-yang-compiler-api":"mvn:org.onosproject:onos-yang-compiler-api:1.12.0-b6",
+    "onos-yang-runtime":"mvn:org.onosproject:onos-yang-runtime:1.12.0-b6",
     "org.apache.servicemix.bundles.dom4j":"mvn:org.apache.servicemix.bundles:org.apache.servicemix.bundles.dom4j:1.6.1_5",
     "openflowj-3.0": {
       "uri": "mvn:org.projectfloodlight:openflowj:3.0.0-SNAPSHOT",