Bump pillow from 6.2.1 to 7.1.2 in /src/requirements (#521)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.2.1 to 7.1.2.
- [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/6.2.1...7.1.2)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

src/requirements/production.txt

@@ -24,7 +24,7 @@ ipython==7.14.0
 irc3==1.1.5
 lxml==4.5.0
 olefile==0.46
-Pillow==6.2.1
+Pillow==7.1.2
 pipdeptree==0.13.2
 psycopg2-binary==2.8.5
 pyOpenSSL==19.1.0