Update more-itertools to 8.9.0

[pyup-bot]

This PR updates more-itertools from 8.6.0 to 8.9.0.

Changelog

8.9.0

-----

* New functions
 * :func:`interleave_evenly` (thanks to mbugert)
 * :func:`repeat_each` (thanks to FinalSh4re)
 * :func:`chunked_even` (thanks to valtron)
 * :func:`map_if` (thanks to sassbalint)
 * :func:`zip_broadcast` (thanks to kalekundert)

* Changes to existing functions
 * The type stub for :func:`chunked` was improved (thanks to  PhilMacKay)
 * The type stubs for :func:`zip_equal` and `zip_offset` were improved (thanks to maffoo)
 * Building Sphinx docs locally was improved (thanks to MarcinKonowalczyk)

8.8.0

-----

* New functions
 * :func:`countable` (thanks to krzysieq)

* Changes to existing functions
 * :func:`split_before` was updated to handle empy collections (thanks to TiunovNN)
 * :func:`unique_everseen` got a performance boost (thanks to Numerlor)
 * The type hint for :func:`value_chain` was corrected (thanks to vr2262)

8.7.0

-----

* New functions
 * :func:`convolve` (from the Python itertools docs)
 * :func:`product_index`, :func:`combination_index`, and :func:`permutation_index` (thanks to N8Brooks)
 * :func:`value_chain` (thanks to jenstroeger)

* Changes to existing functions
 * :func:`distinct_combinations` now uses a non-recursive algorithm (thanks to  knutdrand)
 * :func:`pad_none` is now the preferred name for :func:`padnone`, though the latter remains available.
 * :func:`pairwise` will now use the Python standard library implementation on Python 3.10+
 * :func:`sort_together` now accepts a ``key`` argument (thanks to brianmaissy)
 * :func:`seekable` now has a ``peek`` method, and can indicate whether the iterator it's wrapping is exhausted (thanks to gsakkis)
 * :func:`time_limited` can now indicate whether its iterator has expired (thanks to roysmith)
 * The implementation of :func:`unique_everseen` was improved (thanks to plammens)

* Other changes:
 * Various documentation updates (thanks to cthoyt, Evantm, and cyphase)

Links

• PyPI: https://pypi.org/project/more-itertools
• Changelog: https://pyup.io/changelogs/more-itertools/
• Repo: https://github.com/more-itertools/more-itertools
• Docs: https://pythonhosted.org/more-itertools/

[pyup-bot]

Closing this in favor of #104