fix(deps): update dependency org.apache.httpcomponents.client5:httpclient5 to v5.6

Author: renovate[bot]

metrics-httpclient5/pom.xml

@@ -18,7 +18,7 @@
 
     <properties>
         <javaModuleName>io.dropwizard.metrics5.httpclient5</javaModuleName>
-        <http-client.version>5.5.2</http-client.version>
+        <http-client.version>5.6</http-client.version>
     </properties>
 
     <dependencyManagement>