Upgrade pillow to 7.2.0

[mkoeppe]

(from #30103)

On this ticket:

• Upgrade https://pypi.org/project/Pillow/ to 7.2.0 (latest as of 2020-07-11; supports Python >= 3.5)

CC: @jhpalmieri @antonio-rojas @dimpase @orlitzky

Component: packages: standard

Author: Matthias Koeppe

Branch/Commit: 2cbfdf2

Reviewer: John Palmieri

Issue created by migration from https://trac.sagemath.org/ticket/30185

[mkoeppe]

Branch: u/mkoeppe/upgrade_pillow_to_7_2_0

[mkoeppe]

Commit: 2cbfdf2

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

New commits:

2cbfdf2

build/pkgs/pillow: Update to 7.2.0

[mkoeppe]

comment:3

Tests run at https://github.com/mkoeppe/sage/actions/runs/178114621

[jhpalmieri]

comment:4

It looks okay to me, but I'm not sure what function Pillow serves within Sage, so it's hard to know if it's actually working. I did try it with the new matplotlib, which apparently uses it instead of libpng for all of its plotting, and things looked good when I created some sample plots. I'm going to mark it as "positive review" since it's an upgrade to an existing package and it appears to work.

[jhpalmieri]

Reviewer: John Palmieri

[mkoeppe]

comment:5

Thanks! Yes, as far as I know, it's only used by matplotlib.

[DaveWitteMorris]

comment:6

FWIW: My search of the src directory indicates that SageTeX is the only other package that has pillow as a dependency.

[vbraun]

Changed branch from u/mkoeppe/upgrade_pillow_to_7_2_0 to 2cbfdf2