build(deps): bump pillow in /samples/snippets/crop_hints (#228)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.3.1 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@8.3.1...8.3.2)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

vision/snippets/crop_hints/requirements.txt

@@ -1,2 +1,2 @@
 google-cloud-vision==2.4.2
-pillow==8.3.1
+pillow==8.3.2