bump package versions (#1661)

Author: brycewang-microsoft

pom.xml

@@ -195,8 +195,8 @@
         <dice-provider-artifact-id>dice-provider</dice-provider-artifact-id>
         <x509-provider-artifact-id>x509-provider</x509-provider-artifact-id>
 
-        <iot-device-client-version>2.1.3</iot-device-client-version>
-        <iot-service-client-version>2.1.5</iot-service-client-version>
+        <iot-device-client-version>2.1.4</iot-device-client-version>
+        <iot-service-client-version>2.1.6</iot-service-client-version>
         <provisioning-device-client-version>2.0.3</provisioning-device-client-version>
         <provisioning-service-client-version>2.0.2</provisioning-service-client-version>
         <security-provider-version>2.0.1</security-provider-version>