[MacPorts] #67607: CI on GitHub are broken: Error: Process completed with exit code 60

[MacPorts]

#67607: CI on GitHub are broken: Error: Process completed with exit code 60
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  Reporter:  barracuda156   |      Owner:  admin@…
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  buildbot/mpbb  |    Version:  2.8.1
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by chrstphrchvz):

 Replying to [ticket:67607 barracuda156]:
 > {{{
 >   Error: Process completed with exit code 60.
 > }}}

 The [https://github.com/macports/macports-
 ports/blob/4a79fd1a193bcce1a7fce4c5a216f685bdc6bb5e/.github/workflows/bootstrap.sh#LL40C39-L40C67
 curl process which fetches the PortIndex] is exiting with code 60 because
 the SSL certificate of ftp.fau.de has expired.

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Ticket URL: <https://trac.macports.org/ticket/67607#comment:1>
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