Pip-compile-multi

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* Add ``--uv`` flag to use UV instead of pip-tools.
(PR `483`_, thanks to `Mustafa Tevfik Kadan`_).

.. _483: https://github.com/peterdemin/pip-compile-multi/pull/483
.. _Mustafa Tevfik Kadan: https://github.com/ktevfik

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* Remove Python 3.8 from tested versions
Using Python 3.9 as the base version going forward.

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* Add ``--strip-extras`` pass-through flag.
(PR `455`_, thanks to `Tim Vergenz`_).

.. _455: https://github.com/peterdemin/pip-compile-multi/pull/455
.. _Tim Vergenz: https://github.com/vergenzt

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* Allow version constraints in ``--upgrade-package`` parameters.
(Issue `392`_, PR `394`_, thanks to `Peter Law`_).

.. _392: https://github.com/peterdemin/pip-compile-multi/issues/392
.. _394: https://github.com/peterdemin/pip-compile-multi/pull/394
.. _Peter Law: https://github.com/PeterJCLaw

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* Fix package name normalization for names with delimiters (``urltemplate`` != ``url-template``).

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* Add ``--backtracking/--no-backtracking`` flag
(`backtracking docs <https://pip-compile-multi.readthedocs.io/en/latest/features.html#backtracking-resolver>`_).
(Issue `345`_, PR `360`_)
* Bumped ``pip-tools`` minimum version constraint to ``6.8.0`` to support ``--resolver`` option.

.. _345: https://github.com/peterdemin/pip-compile-multi/issues/345
.. _360: https://github.com/peterdemin/pip-compile-multi/pull/360