Pip-compile-multi

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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

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* Fix cross-env package names matching when they use delimiters (-_.) and upper/lower case.

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* Add ``--emit_trusted_host/--no-emit_trusted_host`` flag
(`trusted host annotation docs <https://pip-compile-multi.readthedocs.io/en/latest/features.html#add-trusted-host-annotation>`_).
Thanks to `Phil Blackwood`_
(Issue `351`_, PR `353`_).

* Remove Python 3.6 and 3.7 from tested versions
(package works, but maintaining CI becomes problematic).
Using Python 3.8 as the base version going forward.

.. _Phil Blackwood: https://github.com/philblckwd
.. _351: https://github.com/peterdemin/pip-compile-multi/issues/351
.. _353: https://github.com/peterdemin/pip-compile-multi/pull/353

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* Add support for `PEP-426: environment markers <https://peps.python.org/pep-0426/>`_.