Bump beautifulsoup4 from 4.9.3 to 4.11.2 (#2239)

Bumps [beautifulsoup4](https://www.crummy.com/software/BeautifulSoup/bs4/) from 4.9.3 to 4.11.2.

---
updated-dependencies:
- dependency-name: beautifulsoup4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

base-requirements.txt

@@ -16,7 +16,7 @@ python-decouple==3.4
 lxml==4.6.3
 cssselect==1.1.0
 feedparser==6.0.8
-beautifulsoup4==4.9.3
+beautifulsoup4==4.11.2
 icalendar==4.0.7
 chardet==4.0.0
 # TODO: We may drop 'django-imagekit' completely.