Bump pillow from 8.1.0 to 8.3.2

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.1.0 to 8.3.2.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.1.0...8.3.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 numpy==1.19.5
-Pillow==8.1.0
+Pillow==8.3.2
 torch==1.7.1
 torchvision==0.8.2
 typing-extensions==3.7.4.3