package/python-pillow: security bump to version 8.3.2

- Fix CVE-2021-23437 Raise ValueError if color specifier is too long
- Fix 6-byte OOB read in FliDecode
- Update indentation in hash file (two spaces)

https://github.com/python-pillow/Pillow/releases/tag/8.3.2



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>