Bump pillow from 8.1.0 to 8.1.2

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.1.0 to 8.1.2.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.1.0...8.1.2)

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

requirements.txt

@@ -13,7 +13,7 @@ drf-writable-nested==0.6.2
 gunicorn==20.0.4
 lxml==4.6.2
 Markdown==3.3.4
-Pillow==8.1.0
+Pillow==8.1.2
 psycopg2-binary==2.8.6
 python-dotenv==0.15.0
 requests==2.25.1