Update markupsafe to 2.1.0

[pyup-bot]

This PR updates MarkupSafe from 1.1.1 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`

2.0.1

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

Released 2021-05-18

-   Mark top-level names as exported so type checking understands
 imports in user projects. :pr:`215`
-   Fix some types that weren't available in Python 3.6.0. :pr:`215`

2.0.0

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

Released 2021-05-11

-   Drop Python 2.7, 3.4, and 3.5 support.
-   ``Markup.unescape`` uses :func:`html.unescape` to support HTML5
 character references. :pr:`117`
-   Add type annotations for static typing tools. :pr:`149`

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 #118