isort: upgraded package to upstream

Upgraded dev-python/isort to version 5.8.0 on amd64

Note: isort is compatible with Python 3.6, but this was not reflected
in the upstream Gentoo package.  I modified the PYTHON_COMPAT to
accomidate this.  No other changes were made.

BUG=b:192389533
TEST=sudo emerge dev-python/isort
     "isort --version" reports 5.8.0

Change-Id: Iafae311aac90fee116606ec1a6c4fee12db7cac6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2995141
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Auto-Submit: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
6 files changed