Tblib

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* Improved performance of ``as_traceback`` by a large factor.
Contributed by Haoyu Weng in `81 <https://github.com/ionelmc/python-tblib/pull/81>`_.
* Dropped support for now-EOL Python 3.8 and added 3.13 in the test grid.

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* Added support for ``__context__``, ``__suppress_context__`` and ``__notes__``.
Contributed by Tim Maxwell in `72 <https://github.com/ionelmc/python-tblib/pull/72>`_.
* Added the ``get_locals`` argument to ``tblib.pickling_support.install()``, ``tblib.Traceback`` and ``tblib.Frame``.
Fixes `41 <https://github.com/ionelmc/python-tblib/issues/41>`_.
* Dropped support for now-EOL Python 3.7 and added 3.12 in the test grid.

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* Removed support for legacy Pythons (2.7 and 3.6) and added Python 3.11 in the test grid.
* Some cleanups and refactors (mostly from ruff).

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* Add more attributes to ``Frame`` and ``Code`` objects for pytest compatibility. Contributed by Ivanq in
`58 <https://github.com/ionelmc/python-tblib/pull/58>`_.

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* When pickling an Exception, also pickle its traceback and the Exception chain
(``raise ... from ...``). Contributed by Guido Imperiale in
`53 <https://github.com/ionelmc/python-tblib/issues/53>`_.

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* Added support for Python 3.8. Contributed by Victor Stinner in
`42 <https://github.com/ionelmc/python-tblib/issues/42>`_.
* Removed support for end of life Python 3.4.
* Few CI improvements and fixes.