Adopt latest patch release for http client (#1227)

This commit updates the `org.apache.httpcomponents.client5` dep to get the latest
bug fixes.

Release notes: https://github.com/apache/httpcomponents-client/blob/rel/v5.6.1/RELEASE_NOTES.txt

Co-authored-by: Laura Trotta <153528055+l-trotta@users.noreply.github.com>

Author: donoghuc

rest5-client/build.gradle.kts

@@ -140,7 +140,7 @@ signing {
 dependencies {
     // Apache 2.0
     // https://hc.apache.org/httpcomponents-client-ga/
-    api("org.apache.httpcomponents.client5","httpclient5","5.6")
+    api("org.apache.httpcomponents.client5","httpclient5","5.6.1")
 
     // Apache 2.0
     // http://commons.apache.org/logging/