Bump divviup-client from 0.4.14 to 0.4.15 (#3495)

Bumps [divviup-client](https://github.com/divviup/divviup-api) from 0.4.14 to 0.4.15.
- [Release notes](https://github.com/divviup/divviup-api/releases)
- [Commits](divviup/divviup-api@0.4.14...0.4.15)

---
updated-dependencies:
- dependency-name: divviup-client
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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