Bump httpclient from 4.5.2 to 4.5.13

Bumps httpclient from 4.5.2 to 4.5.13.

---
updated-dependencies:
- dependency-name: org.apache.httpcomponents:httpclient
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -36,7 +36,7 @@
 
     <cdap.version>6.2.0</cdap.version>  
     <gson.version>2.3</gson.version>
-    <http.version>4.5.2</http.version>
+    <http.version>4.5.13</http.version>
     <plugin.version>2.4.0</plugin.version>  
     <spark.version>2.1.3</spark.version>