Bump whitenoise from 6.1.0 to 6.9.0

Bumps [whitenoise](https://github.com/evansd/whitenoise) from 6.1.0 to 6.9.0.
- [Changelog](https://github.com/evansd/whitenoise/blob/main/docs/changelog.rst)
- [Commits](evansd/whitenoise@6.1.0...6.9.0)

---
updated-dependencies:
- dependency-name: whitenoise
  dependency-version: 6.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/base.txt

@@ -16,7 +16,7 @@ python-akismet==0.4.2
 requests==2.26.0
 six==1.15.0
 urllib3==1.26.6
-whitenoise==6.1.0
+whitenoise==6.9.0
 psycopg2-binary==2.9.3
 djangorestframework==3.12.4
 django-htmx==1.15.0