pytest: upgraded package to upstream

Upgraded dev-python/pytest to version 4.4.0 on amd64

BUG=chromium:934414
TEST=None
CQ-DEPEND=CL:1565393

Change-Id: I3104af5dca6f1c0dee7a5c598f4c6c3474addad6
Reviewed-on: https://chromium-review.googlesource.com/1562104
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
8 files changed