Bump whitenoise[brotli] from 6.3.0 to 6.4.0

Bumps [whitenoise[brotli]](https://github.com/evansd/whitenoise) from 6.3.0 to 6.4.0.
- [Release notes](https://github.com/evansd/whitenoise/releases)
- [Changelog](https://github.com/evansd/whitenoise/blob/main/docs/changelog.rst)
- [Commits](https://github.com/evansd/whitenoise/compare/6.3.0...6.4.0)

---
updated-dependencies:
- dependency-name: whitenoise[brotli]
dependency-type: direct:production
update-type: version-update:semver-minor
...

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

requirements.txt

@@ -1,4 +1,4 @@
 Django==4.1.7
 psycopg2==2.9.5
 python-dotenv==0.21.1
-whitenoise[brotli]==6.3.0
+whitenoise[brotli]==6.4.0