build(deps): bump prettyplease from 0.2.14 to 0.2.15

Bumps [prettyplease](https://github.com/dtolnay/prettyplease) from 0.2.14 to 0.2.15.
- [Release notes](https://github.com/dtolnay/prettyplease/releases)
- [Commits](dtolnay/prettyplease@0.2.14...0.2.15)

---
updated-dependencies:
- dependency-name: prettyplease
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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