Update markupsafe to 2.1.0

[pyup-bot]

This PR updates markupsafe from 2.0.1 to 2.1.0.

Changelog

2.1.0

-------------

Released 2022-02-17

-   Drop support for Python 3.6. :pr:`262`
-   Remove ``soft_unicode``, which was previously deprecated. Use
 ``soft_str`` instead. :pr:`261`
-   Raise error on missing single placeholder during string
 interpolation. :issue:`225`
-   Disable speedups module for GraalPython. :issue:`277`

Links

• PyPI: https://pypi.org/project/markupsafe
• Changelog: https://pyup.io/changelogs/markupsafe/
• Homepage: https://palletsprojects.com/p/markupsafe/

[pyup-bot]

Closing this in favor of #1832