[metrics-bugs] #25217 [Metrics]: metrics-base: Update checkstyle to debian stable

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#25217: metrics-base: Update checkstyle to debian stable
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     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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 Verify that all works as expected (which should be the case) and update to
 the latest available and working version.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25217>
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