* Add py3.12 support

- CI
- tox
- requisite ignore for dateutil (at time of writing)
- changelog item

* Move pytest config into setup.cfg

* Fix datetime deprecation warning pattern

In pytest config -- using `datetime.datetime.utcfromtimestamp` is
important for matching correctly.

For some reason, the previous pattern (as well as the fixed one) works
under a local dev environment with 3.12.

Bumps [ruamel-yaml]() from 0.17.33 to 0.18.5.

---
updated-dependencies:
- dependency-name: ruamel-yaml
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

github-workflows-require-timeout now supports expression eval blocks
in the value for the timeout. Two test-cases ensure that such
workflows will pass, based on the example provided in #354

resolves #354

There is also a small refinement to test outputs here, which was added
while testing this addition.

Co-authored-by: sirosen <sirosen@users.noreply.github.com>

Support expressions in GHA require-timeout schema

Add vendoring of cloudbuild schema