Update lazy-object-proxy to 1.7.1

[pyup-bot]

This PR updates lazy-object-proxy from 1.6.0 to 1.7.1.

Changelog

1.7.1

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* Removed most of the Python 2 support code and fixed ``python_requires`` to require at least Python 3.6.

Note that 1.7.0 has been yanked because it could not install on Python 2.7.
Installing lazy-object-proxy on Python 2.7 should automatically fall back to the 1.6.0 release now.

1.7.0

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* Switched CI to GitHub Actions, this has a couple consequences:

* Support for Python 2.7 is dropped. You can still install it there but it's not tested anymore and
 Python 2 specific handling will be removed at some point.
* Linux wheels are now provided in `musllinux` and `manylinux2014` variants.

* Fixed ``__index__`` to fallback to ``int`` if the wrapped object doesn't have an ``__index__`` method.
This prevents situations where code using a proxy would otherwise likely just call ``int`` had the object
not have an ``__index__`` method.

Links

• PyPI: https://pypi.org/project/lazy-object-proxy
• Changelog: https://pyup.io/changelogs/lazy-object-proxy/
• Repo: https://github.com/ionelmc/python-lazy-object-proxy