chore(deps): bump ruamel-yaml from 0.18.10 to 0.18.15 (#42)

Bumps ruamel-yaml from 0.18.10 to 0.18.15.

---
updated-dependencies:
- dependency-name: ruamel-yaml
  dependency-version: 0.18.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]