Bump @openapitools/openapi-generator-cli from 2.28.0 to 2.31.0

Bumps [@openapitools/openapi-generator-cli](https://github.com/OpenAPITools/openapi-generator-cli) from 2.28.0 to 2.31.0.
- [Release notes](https://github.com/OpenAPITools/openapi-generator-cli/releases)
- [Commits](OpenAPITools/openapi-generator-cli@v2.28.0...v2.31.0)

---
updated-dependencies:
- dependency-name: "@openapitools/openapi-generator-cli"
  dependency-version: 2.31.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]