JCLOUDS-1462: Upgrade Apache Http driver to 4.3.6

In response to https://nvd.nist.gov/vuln/detail/CVE-2015-5262
diff --git a/drivers/apachehc/pom.xml b/drivers/apachehc/pom.xml
index c42f7d7..f07de14 100644
--- a/drivers/apachehc/pom.xml
+++ b/drivers/apachehc/pom.xml
@@ -63,7 +63,7 @@
     <dependency>
       <groupId>org.apache.httpcomponents</groupId>
       <artifactId>httpclient</artifactId>
-      <version>4.3.4</version>
+      <version>4.3.6</version>
       <scope>compile</scope>
     </dependency>
     <dependency>