Prepare release with device.mgt 4.1.8 and plugin 4.0.8

pom.xml

@@ -1471,7 +1471,7 @@
         <carbon.governance.version>4.7.23</carbon.governance.version>
 
         <!-- Carbon Device Management-->
-        <carbon.device.mgt.version>4.1.7</carbon.device.mgt.version>
+        <carbon.device.mgt.version>4.1.8</carbon.device.mgt.version>
 
         <carbon.device.mgt.version.range>[4.0.0, 5.0.0)</carbon.device.mgt.version.range>
 
@@ -1479,7 +1479,7 @@
         <product.iot.version>${project.version}</product.iot.version>
 
         <!-- Carbon Device Management Plugins-->
-        <carbon.device.mgt.plugin.version>5.0.7</carbon.device.mgt.plugin.version>
+        <carbon.device.mgt.plugin.version>5.0.8</carbon.device.mgt.plugin.version>
 
         <!-- API Management -->
         <carbon.api.mgt.version>6.2.201</carbon.api.mgt.version>