python-utils: Update to upstream

This is needed for upgrading ws4py, gevent, and greenlet.

This maintains the fix from crrev.com/c/1440268.

See crrev.com/c/1904637.

BUG=chromium:1022557, b:144061947
TEST=CQ+1

Change-Id: I4b8ef70c504869415fe3da8405da6f1a054ec71b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/2010345
Tested-by: Craig Hesling <hesling@chromium.org>
Commit-Queue: Craig Hesling <hesling@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>