Bump pillow from 7.1.2 to 7.2.0 in /cvat/requirements (#1828)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 7.1.2 to 7.2.0.
- [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/7.1.2...7.2.0)

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cvat/requirements/base.txt

@@ -6,7 +6,7 @@ django-cacheops==5.0
 django-compressor==2.4
 django-rq==2.0.0
 EasyProcess==0.3
-Pillow==7.1.2
+Pillow==7.2.0
 numpy==1.18.5
 python-ldap==3.3.1
 pytz==2020.1