Update dependency org.apache.httpcomponents:httpclient to v4.5.8 (#671)

Author: renovate-bot

pom.xml

@@ -551,7 +551,7 @@
     <project.guava.version>26.0-android</project.guava.version>
     <project.xpp3.version>1.1.4c</project.xpp3.version>
     <project.commons-logging.version>1.2</project.commons-logging.version>
-    <project.httpclient.version>4.5.5</project.httpclient.version>
+    <project.httpclient.version>4.5.8</project.httpclient.version>
     <project.opencensus.version>0.19.2</project.opencensus.version>
     <project.root-directory>..</project.root-directory>
   </properties>