[metrics-bugs] #31194 [Metrics/Library]: Upgrade metrics-lib to Debian buster libraries

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#31194: Upgrade metrics-lib to Debian buster libraries
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     Reporter:  karsten          |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Library  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:  #31193
       Points:                   |   Reviewer:
      Sponsor:                   |
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 I already updated most libraries in metrics-base and metrics-lib master to
 Debian buster for #31172 to fix the Jenkins build. We should review those
 changes anyway, which is why I'm creating this ticket. Commits are:

  - [https://gitweb.torproject.org/metrics-
 base.git/commit/?id=e12ba96aa0708b20375cf7cf5d20dfa19940d18a e12ba96 in
 metrics-base.git] and
  - [https://gitweb.torproject.org/metrics-
 lib.git/commit/?id=453a6f5acb9b9935a88de8c6e39e05e29b5423e7 453a6f5 in
 metrics-lib.git].

 We'll also have to resolve an issue with the latest Checkstyle version
 8.15 ("Unable to create Root Module"). I don't really know how to start
 debugging this, so I'll leave this for others for now.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31194>
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