Bump pillow from 6.2.0 to 6.2.1

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.2.0 to 6.2.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@6.2.0...6.2.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -1,5 +1,5 @@
 # native dependencies
-Pillow==6.2.0
+Pillow==6.2.1
 lxml==4.4.1
 defusedxml==0.6.0
 psycopg2==2.8.4