[metrics-bugs] #34261 [Metrics/Onionperf]: Remove pandas warning when using bullseye version of pandas

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#34261: Remove pandas warning when using bullseye version of pandas
-----------------------------------+--------------------------
     Reporter:  karsten            |      Owner:  metrics-team
         Type:  defect             |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:  0.2                |   Reviewer:
      Sponsor:  Sponsor59          |
-----------------------------------+--------------------------
 The following warning is shown when using OnionPerf's visualize mode with
 version 0.25.3 of pandas (contained in Debian bullseye). It is not shown
 when using buster's version of pandas. If there's an easy way to remove
 the warning when using either version, let's do it.

 {{{
     /usr/lib/python3/dist-
 packages/pandas/plotting/_matplotlib/converter.py:103: FutureWarning:
 Using an implicitly registered datetime converter for a matplotlib
 plotting method. The converter was registered by pandas on import. Future
 versions of pandas will require you to explicitly register matplotlib
 converters.

     To register the converters:
         >>> from pandas.plotting import register_matplotlib_converters
         >>> register_matplotlib_converters()
       warnings.warn(msg, FutureWarning)
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34261>
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