Bump chardet from 4.0.0 to 5.2.0

Bumps [chardet](https://github.com/chardet/chardet) from 4.0.0 to 5.2.0.
- [Release notes](https://github.com/chardet/chardet/releases)
- [Commits](chardet/chardet@4.0.0...5.2.0)

---
updated-dependencies:
- dependency-name: chardet
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

base-requirements.txt

@@ -18,7 +18,7 @@ cssselect==1.1.0
 feedparser==6.0.8
 beautifulsoup4==4.11.2
 icalendar==4.0.7
-chardet==4.0.0
+chardet==5.2.0
 celery[redis]==5.3.6
 django-celery-beat==2.5.0
 # TODO: We may drop 'django-imagekit' completely.