awscli: relax pyyaml dependency

Upstream made this change in later awscli versions. Let's pick it up to
fix the build after the recent pyyaml upgrade.

BUG=b/337295830
TEST=presubmit
RELEASE_NOTE=None

cos-patch: bug
Change-Id: I11b2ed4ff05b5e9a7ee5be815131eac6c9c8e9d7
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/70596
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Chenglong Tang <chenglongtang@google.com>
1 file changed