Update httpclient.version to v5.4

Author: renovate[bot]

pom.xml

@@ -43,7 +43,7 @@
 
   <properties>
     <gitHubRepo>jenkinsci/apache-httpcomponents-client-5-api-plugin</gitHubRepo>
-    <httpclient.version>5.3.1</httpclient.version>
+    <httpclient.version>5.4</httpclient.version>
     <httpcore.version>5.3</httpcore.version>
     <jenkins.version>2.361.4</jenkins.version>
     <revision>${httpclient.version}</revision>