Bump pillow from 7.2.0 to 8.0.1 in /src

Bumps [pillow](https://github.com/python-pillow/Pillow) from 7.2.0 to 8.0.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@7.2.0...8.0.1)

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

src/requirements.txt

@@ -9,7 +9,7 @@ mock==4.0.2
 nose>=1.1.2
 pexpect==4.8.0
 pickleshare==0.7.5
-pillow==7.2.0
+pillow==8.0.1
 plotly==4.11.0
 pyasn1==0.4.8
 pycrypto>=2.6