Bump pillow from 6.1.0 to 6.2.0 in /CTAI_model

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.1.0 to 6.2.0.
- [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/6.1.0...6.2.0)

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

CTAI_model/requirements.txt

@@ -2,7 +2,7 @@ Flask==1.1.1
 Werkzeug==0.15.2
 pandas==0.23.4
 numpy==1.15.0
-Pillow==6.1.0
+Pillow==6.2.0
 SimpleITK==1.2.2
 matplotlib==3.1.1
 numba==0.45.1