yaml should be listed as a runtime dependency

[Jakub Kulik]

When I install oslo.utils using pip and try to import oslo_utils.fileutils, I get the following error:

>>> import oslo_utils.fileutils
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/scratch/userland-gate/components/venv/lib/python3.7/site-packages/oslo_utils/fileutils.py", line 30, in <module>
    import yaml
ModuleNotFoundError: No module named 'yaml'

I presume it's because of missing pyyaml dependency.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/oslo.utils/+/897617

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/oslo.utils/+/897617
Committed: https://opendev.org/openstack/oslo.utils/commit/d6b9e846e4e22cd94f8321380a67ce842d4f4afb
Submitter: "Zuul (22348)"
Branch: master

commit d6b9e846e4e22cd94f8321380a67ce842d4f4afb
Author: Takashi Kajinami <email address hidden>
Date: Sat Oct 7 11:12:03 2023 +0900

    Fix missing PyYAML dependency

    PyYAML is required by oslo_utils.fileutils, but has been missing from
    requirements.

    Closes-Bug: #1977850
    Change-Id: I80afbf26c92e20f64904e0e431360dd269b96f23

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/oslo.utils 6.3.0 release.