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
...

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

Author: dependabot[bot]