Update pytest to 5.4.3

This fixes the confusing "TypeError: unhashable type: 'ExceptionChainRepr'"
message when an error is encountered while the test worker pool is being
initialized.

Upstream bug: https://github.com/pytest-dev/pytest/issues/7183

BUG=None
TEST=`run_pytest

Change-Id: I2f13c6fe8fff0671825446087724511aef1344d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra_virtualenv/+/2714171
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Auto-Submit: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
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