Bump pillow from 8.1.1 to 8.2.0 in /requirements (#3410)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.1.1 to 8.2.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](https://github.com/python-pillow/Pillow/compare/8.1.1...8.2.0)

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

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requirements/requirements.txt

@@ -24,7 +24,7 @@ pytz==2019.3
 python-magic==0.4.15
 unipath==1.1
 WeasyPrint==51
-Pillow==8.1.1
+Pillow==8.2.0
 gunicorn==19.9.0
 more-itertools==8.2.0
 pysolr==3.6.0