Bump pillow from 7.1.0 to 8.2.0 in /api

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]>

Author: dependabot[bot]

api/requirements.txt

@@ -12,7 +12,7 @@ apscheduler==3.6.3
 python-dateutil==2.8.1
 psycopg2==2.8.4
 boto3==1.10.45
-Pillow==7.1.0
+Pillow==8.2.0
 pytest==5.3.2
 supervisor==4.1.0
 pytest-cov==2.8.1