Update whitenoise requirement from <5.4,>=5.2 to >=5.2,<6.1

Updates the requirements on [whitenoise](https://github.com/evansd/whitenoise) to permit the latest version.
- [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/v5.2.0...6.0.0)

---
updated-dependencies:
- dependency-name: whitenoise
  dependency-type: direct:production
...

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

requirements.txt

@@ -14,7 +14,7 @@ pysolr>=3.9,<3.10
 redis>=3.5,<4.2
 requests>=2.25,<3
 uWSGI>=2.0.19,<2.1
-whitenoise>=5.2,<5.4
+whitenoise>=5.2,<6.1
 
 # Linting
 flake8==4.0.1