Add httpclient for KeepAliveFeature

Author: ivy-cst

connectivity/connectivity-demos/pom.xml

@@ -24,6 +24,12 @@
       <groupId>com.axonivy.ivy.api</groupId>
       <artifactId>ivy-api</artifactId>
     </dependency>
+
+    <!-- For KeepAliveFeature -->
+    <dependency>
+      <groupId>org.apache.httpcomponents</groupId>
+      <artifactId>httpclient</artifactId>
+    </dependency>
   </dependencies>
   <repositories>
     <repository>