Bump pillow from 8.2.0 to 8.3.2 in /requirements

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.2.0 to 8.3.2.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/master/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.2.0...8.3.2)

---
updated-dependencies:
- dependency-name: pillow
  dependency-type: direct:production
...

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

requirements/requirements-base.txt

@@ -2,6 +2,6 @@ Kivy==2.0.0rc2
 Kivy-Garden==0.1.4
 numpy==1.18.4
 opencv-python==4.2.0.34
-Pillow==8.2.0
+Pillow==8.3.2
 pyzbar==0.1.8
 xcamera==2019.928