Bump yaml from 2.8.4 to 2.9.0

Bumps [yaml](https://github.com/eemeli/yaml) from 2.8.4 to 2.9.0.
- [Release notes](https://github.com/eemeli/yaml/releases)
- [Commits](https://github.com/eemeli/yaml/compare/v2.8.4...v2.9.0)

---
updated-dependencies:
- dependency-name: yaml
  dependency-version: 2.9.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>