- Update to 8.21.0
  * Few new features are present, but the codebase has been
    cleaned, and a couple of API are _considered_ for deprecation.
    They are not deprecated yet, but as they do not seem to be
    quite used, they may emit a warning, in which case please
    comment on the relevant issue to inform me of _which_ project
    use those feature and how you use them. Depending on the
    feedback I might change the timeline for deprecation.
  ## Deprecations
  * PR #14307 Pending Deprecation of
    ColorSchemeTable.set_active_scheme(...)’s case_sensitive
    Parameter.
  * PR #14305 Pending Deprecation of constructing ColorScheme via
    kwargs, in favor passing a single dict.
  ## Fixes
  * PR #14284 TerminalIPythonApp’s would warn that auto_create
    option is not recognized.
  * PR #14286 Fix a crash with NotOneValueFound when rendering
    complex tracebacks.
  * PR #14287 Partial Python 3.13 compatibility
  * PR #14290 Docs/Typos.
  * PR #14289 ipdb.set_trace() now accepts header= for better
  ## Changes
    compatibility with pdb.set_trace()
  * PR #14300 and PR #14301 Add hooking ability to produce
    mimebundle. It is now possible to extend the ?/?? operator to
    return more mimetypes to render richer help in frontends that
    support it. In particular you could send a json representation
    of the help that could be displayed in a customizable way.
- Release 8.20.0
  * The crux of this release is PR #14274 (Inspect continuation
    prompt signature and pass only viable arguments), the rest of
    the changes are mostly type annotation, and a few compatibility
    issues with Python 3.13 that are getting addressed.
- Update to 8.19.0
  * New release of IPython a bit before the end of the month, and
    end of the year.
  * Mostly cleanup and deprecation, due to upstream deprecation and
    removal.
  * A bit later than originally plan, IPython 8.19 does not support
    Python 3.9 anymore, as well as the few conditional code that
    were executing only on Python 3.9. #14254
  * We used the opportunity to deprecate IPython.utils.tz #14256,
    due to upstream deprecation of some timezone utilities. It will
    be removed at a later date.
  * Thanks to the contribution of cohml, IPython CLI now support
    absolute and relative line numbers in both vi and emacs prompt,
    use for example
    c.TerminalInteractiveShell
     .prompt_line_number_format='{line:4d}/{rel_line:+03d} | '
    configuration option to display both in a custom format.

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