Upgrade Apache Http client version

Author: zoewangg

.changes/next-release/feature-AWSSDKforJavav2-04977cd.json

@@ -0,0 +1,6 @@
+{
+    "category": "AWS SDK for Java v2", 
+    "contributor": "", 
+    "type": "feature", 
+    "description": "Upgrade `org.apache.httpcomponents:httpclient` version to `4.5.13`"
+}

pom.xml

@@ -152,7 +152,7 @@
         <aspectj.version>1.8.2</aspectj.version>
 
         <jre.version>1.8</jre.version>
-        <httpcomponents.httpclient.version>4.5.9</httpcomponents.httpclient.version>
+        <httpcomponents.httpclient.version>4.5.13</httpcomponents.httpclient.version>
         <httpcomponents.httpcore.version>4.4.11</httpcomponents.httpcore.version>
 
         <!-- These properties are used by cucumber tests related code -->