Force plugin revision to 5.4 so it will supersede prior 5.4 release

If the default revision value is used, then users that installed the
earlier 5.4 releases will not see the new release because Jenkins will
consider it to be an older version.

pom.xml

@@ -46,7 +46,9 @@
     <httpclient.version>5.3.1</httpclient.version>
     <httpcore.version>5.3.1</httpcore.version>
     <jenkins.version>2.361.4</jenkins.version>
-    <revision>${httpclient.version}</revision>
+    <!-- TODO: Revert to ${httpclient.version} once https://github.com/jenkinsci/apache-httpcomponents-client-5-api-plugin/issues/59 is fixed -->
+    <!-- <revision>${httpclient.version{</revision> -->
+    <revision>5.4</revision>
     <changelist>999999-SNAPSHOT</changelist>
     <spotless.check.skip>false</spotless.check.skip>
   </properties>