Fixed jenkinsci#402 - Upgrade httpclient/httpcore/httpmime to 4.5.8

Author: khmarbaise

pom.xml

@@ -60,9 +60,9 @@
     <commons-lang.version>3.8.1</commons-lang.version>
     <guava.version>17.0</guava.version>
     <json-lib.version>2.4</json-lib.version>
-    <httpclient.version>4.3.6</httpclient.version>
-    <httpcore.version>4.3.3</httpcore.version>
-    <httpmime.version>4.3.6</httpmime.version>
+    <httpclient.version>4.5.8</httpclient.version>
+    <httpcore.version>4.5.8</httpcore.version>
+    <httpmime.version>4.5.8</httpmime.version>
     <jackson-databind.version>2.9.6</jackson-databind.version>
   </properties>