Switch from pattern.en to inflect

Change-Id: Ice314b136b9f7fe58ca978885f43ce346d337f3e
diff --git a/containers/chameleon/Dockerfile.chameleon b/containers/chameleon/Dockerfile.chameleon
index c5bddd5..c37ef00 100644
--- a/containers/chameleon/Dockerfile.chameleon
+++ b/containers/chameleon/Dockerfile.chameleon
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # xosproject/chameleon
-FROM xosproject/xos-base:2.1.14
+FROM xosproject/xos-base:2.1.15
 
 # xos-base already has protoc and dependencies installed