pathspec: upgraded package to upstream

Upgraded dev-python/pathspec to version 0.8.1 on amd64

Note: modified PYTHON_COMPAT to reflect that the package is compatible
with 3.6 (the upstream ebuild required 3.7+).

BUG=b:192389533
TEST=emerge and import pathspec

Change-Id: I20f745a5add81ab806c6f8a804827fecae7e7943
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2998368
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
5 files changed