Explicitly declare dependencies (#1583)

Reduce the risk that new dependencies will be injected accidentally from
a dependency update.

The developer documentation provides more details at
https://www.jenkins.io/doc/developer/plugin-development/dependencies-and-class-loading/#build-time-validation-of-bundled-artifacts

Originally added to Maven hpi plugin in pull request:

* jenkinsci/maven-hpi-plugin#771

Testing done

* Confirmed that automated tests pass

Author: MarkEWaite

pom.xml

@@ -58,6 +58,8 @@ THE SOFTWARE.
   <properties>
     <changelist>999999-SNAPSHOT</changelist>
     <gitHubRepo>jenkinsci/${project.artifactId}-plugin</gitHubRepo>
+    <hpi.bundledArtifacts>antlr-runtime,jsch.agentproxy.connector-factory,jsch.agentproxy.core,jsch.agentproxy.pageant,jsch.agentproxy.sshagent,jsch.agentproxy.svnkit-trilead-ssh2,jsch.agentproxy.usocket-jna,jsch.agentproxy.usocket-nc,lz4-java,sequence-library,sqljet,svnkit</hpi.bundledArtifacts>
+    <hpi.strictBundledArtifacts>true</hpi.strictBundledArtifacts>
     <!-- https://www.jenkins.io/doc/developer/plugin-development/choosing-jenkins-baseline/ -->
     <jenkins.baseline>2.504</jenkins.baseline>
     <jenkins.version>${jenkins.baseline}.3</jenkins.version>