Fix for JDK-8212233 is not a workaround, it should have been done anyway

[jglick]

As per #173 (comment). Despite JDK-8219474 claiming some fix was backported to 11.0.3, it is still reproducible in the AdoptOpenJDK build at least:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:jar (attach-javadocs) on project workflow-durable-task-step: MavenReportException: Error while generating Javadoc: 
[ERROR] Exit code: 1 - javadoc: error - The code being documented uses modules but the packages defined in https://docs.oracle.com/javase/8/docs/api/ are in the unnamed module.
[ERROR] …/jenkinsci/workflow-durable-task-step-plugin/src/main/java/org/jenkinsci/plugins/workflow/support/steps/ExecutorStepExecution.java:374: warning: no @throws for java.io.IOException
[ERROR]         public @CheckForNull FlowNode getNode() throws IOException, InterruptedException {
[ERROR]                                       ^
[ERROR] …/jenkinsci/workflow-durable-task-step-plugin/src/main/java/org/jenkinsci/plugins/workflow/support/steps/ExecutorStepExecution.java:374: warning: no @throws for java.lang.InterruptedException
[ERROR]         public @CheckForNull FlowNode getNode() throws IOException, InterruptedException {
[ERROR]                                       ^
[ERROR] 
[ERROR] Command line was: …/jdk-11.0.3+7/bin/javadoc @options @packages

[jglick]

And IIUC the JDK 11 on ci.jenkins.io got bumped up to 11.0.3 as part of INFRA-2086, breaking #173 suddenly. As I noted to @olblak in that issue, this is why I find it awful to have some unknown tool version injected into my build: it means my unrelated PRs (in this case jenkinsci/workflow-durable-task-step-plugin#104) fail with a cryptic error which I have to drop everything and fix, rather than being able to deal with the problem in a leisurely fashion via @dependabot.

[oleg-nenashev]

Belated 👍