[metrics-bugs] #20596 [Metrics]: add jdk version to manifest files

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#20596: add jdk version to manifest files
-----------------------------+--------------------------
     Reporter:  iwakeh       |      Owner:  metrics-team
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Metrics      |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |   Reviewer:
      Sponsor:               |
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 This concerns all Metrics Java projects.

 An additional attribute tag needs to be added:
 {{{
         <attribute name="JDK-Version"
                    value="${java.runtime.version}"/>
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20596>
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