Bump whitenoise from 4.1.2 to 4.1.4

Bumps [whitenoise](https://github.com/evansd/whitenoise) from 4.1.2 to 4.1.4.
- [Release notes](https://github.com/evansd/whitenoise/releases)
- [Changelog](https://github.com/evansd/whitenoise/blob/master/docs/changelog.rst)
- [Commits](https://github.com/evansd/whitenoise/compare/v4.1.2...v4.1.4

)

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