dev-python/simplejson: Upgrade package from upstream

Newer releases of simplejson support both Python 3.6 and 3.8, let's
upgrade.

Note: this required patching PYTHON_COMPAT to list 3.6 as well.
That's OK since the package itself does, just not the upstream ebuild.

BUG=b:187794810
TEST=sudo emerge dev-python/simplejson

Change-Id: Iaabdbf0db35081b38c0c3ffe5629e25880e98792
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/4288628
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
4 files changed