Update whitenoise to 4.1.2

[pyup-bot]

This PR updates whitenoise from 4.1 to 4.1.2.

Changelog

4.1.2

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* Add correct MIME type for WebAssembly, which is required for files to be
executed (thanks `mdboom <https://github.com/mdboom>`_ ).
* Stop accessing the FILE_CHARSET Django setting which was almost entirely
unused and is now deprecated (thanks `timgraham
<https://github.com/timgraham>`_).

4.1.1

------

* Fix `bug <https://github.com/evansd/whitenoise/issues/202>`_ in ETag
handling (thanks `edmorley <https://github.com/edmorley>`_).
* Documentation fixes (thanks `jamesbeith <https://github.com/jamesbeith>`_
and `mathieusteele <https://github.com/mathieusteele>`_).

Links

• PyPI: https://pypi.org/project/whitenoise
• Changelog: https://pyup.io/changelogs/whitenoise/
• Homepage: http://whitenoise.evans.io

[coveralls]

Pull Request Test Coverage Report for Build 408

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 71.518%

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Totals
Change from base Build 405:	0.0%
Covered Lines:	1489
Relevant Lines:	2082

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💛 - Coveralls

[pyup-bot]

Closing this in favor of #234