[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:  Low          |      Milestone:
Component:  Metrics      |        Version:
 Severity:  Minor        |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
 Reviewer:               |        Sponsor:
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Comment (by iwakeh):

 Replying to [comment:3 karsten]:
 > FWIW, Debian stable still has 6.15 (as expected), there is nothing in
 stretch-backports (also as expected), and both testing and unstable have
 8.8: https://packages.debian.org/search?keywords=checkstyle

 Yes, this is a ticket to not forget to change the non-debian dependency to
 a debian package when a working version is available.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25217#comment:4>
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