Update more-itertools to 8.14.0

[pyup-bot]

This PR updates more-itertools from 8.13.0 to 8.14.0.

Changelog

8.14.0

------

* New functions
 * :func:`longest_common_prefix` (thanks to nanouasyn)
 * :func:`iequals` (thanks to nanouasyn)

* Changes to existing functions
 * `concurrent.futures.ThreadPoolExecutor` is now imported lazily in :func:`callback_iter`.
 * :func:`tail` is now optimized for iterables with a fixed length.

* Other changes
 * Some documentation issues were fixed (thanks to pochmann and timgates42)
 * This library is now marked for Python 3.10 compatibility in PyPI (thanks to chayim)

Links

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