Bump @openapitools/openapi-generator-cli from 2.20.2 to 2.21.2

---
updated-dependencies:
- dependency-name: "@openapitools/openapi-generator-cli"
  dependency-version: 2.21.2
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]