Gitlab-trace

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- Nothing changed yet.

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- Add Python 3.12 support.
- Show the name of the automatically selected job when using ``--running``
- Shorter output for network errors (suppress tracebacks, print just the error
itself).
- Fix DeprecationWarning: ``as_list=False`` is deprecated and will be removed in
a future version. Use ``iterator=True`` instead.

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- ``-t``/``--tail [N]`` for showing the last N lines of the trace log.
- ``-f``/``--follow`` for following a job as it runs.
- ``--running`` for automatically selecting the first running job.

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- Fix UserWarning: Calling a ``list()`` method without specifying ``all=True`` or
``as_list=False`` will return a maximum of 20 items from python-gitlab. Should
now support choosing 21st or more pipeline from the end when invoked as
gitlab-trace -21 etc.

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- Gracefully handle a job having no artifacts instead of spewing chained
tracebacks.
- Add Python 3.10 and 3.11 support.
- Drop Python 3.6 support.

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- Warn about unused command-line arguments (--branch when --job or
pipeline is specified, --artifacts when no job is specified).
- Allow referring to the Nth latest pipeline with -1, -2, -3 instead
of the pipeline number.
- Fix TypeError: sequence item 0: expected str instance, int found
while printing "Found multiple jobs"
- ``--print-url`` for printing the job's or pipeline's URL instead of dumping
the log/list of jobs.
- ``--debug`` now works for pipelines as well.
- Add Python 3.9 support.