Bump pillow from 7.1.0 to 8.2.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 7.1.0 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](python-pillow/Pillow@7.1.0...8.2.0)

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

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

requirements.txt

@@ -5,7 +5,7 @@ Django==3.0.7
 django-crispy-forms==1.8.1
 django-heroku==0.3.1
 gunicorn==20.0.4
-Pillow==7.1.0
+Pillow==8.2.0
 psycopg2==2.8.4
 pycodestyle==2.5.0
 pytz==2019.3