Update dependency org.apache.httpcomponents:httpclient to v4.5.9 (#704)

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>4.5.8</project.httpclient.version>
+    <project.httpclient.version>4.5.9</project.httpclient.version>
     <project.opencensus.version>0.21.0</project.opencensus.version>
     <project.root-directory>..</project.root-directory>
     <deploy.autorelease>false</deploy.autorelease>