[#5015] Bump io.etcd:jetcd-core from 0.8.5 to 0.8.6 (#5105)

Author: chengyouling

dependencies/default/pom.xml

@@ -88,7 +88,7 @@
     <vertx.version>5.0.8</vertx.version>
     <zipkin.version>3.5.1</zipkin.version>
     <zipkin-reporter.version>3.4.0</zipkin-reporter.version>
-    <jetcd-core.version>0.8.5</jetcd-core.version>
+    <jetcd-core.version>0.8.6</jetcd-core.version>
     <consul-client.version>1.8.0</consul-client.version>
     <!-- Base dir of main -->
     <main.basedir>${basedir}/../..</main.basedir>