build(deps-dev): bump @openapitools/openapi-generator-cli

Bumps [@openapitools/openapi-generator-cli](https://github.com/OpenAPITools/openapi-generator-cli) from 2.13.9 to 2.15.0.
- [Release notes](https://github.com/OpenAPITools/openapi-generator-cli/releases)
- [Changelog](https://github.com/OpenAPITools/openapi-generator-cli/blob/master/.releaserc)
- [Commits](OpenAPITools/openapi-generator-cli@v2.13.9...v2.15.0)

---
updated-dependencies:
- dependency-name: "@openapitools/openapi-generator-cli"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>