Upgrade to HttpClient 5.5

Closes gh-1650

Author: snicoll

spring-ws-platform/build.gradle

@@ -50,7 +50,7 @@ dependencies {
 		api("jaxen:jaxen:2.0.0")
 		api("net.minidev:json-smart:2.5.2")
 		api("org.apache.commons:commons-collections4:4.5.0")
-		api("org.apache.httpcomponents.client5:httpclient5:5.4.3")
+		api("org.apache.httpcomponents.client5:httpclient5:5.5")
 		api("org.apache.httpcomponents:httpclient:4.5.14")
 		api("org.apache.santuario:xmlsec:4.0.4")
 		api("org.apache.wss4j:wss4j-ws-security-dom:4.0.0")