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

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -46,4 +46,4 @@ social_auth_app_django==3.1.0
 tomd==0.1.3
 wagtail==2.5.1
 wagtail-cache==0.5.2
-whitenoise==4.1.2
+whitenoise==4.1.4