Bump openapi generator version to a version that includes https://github.com/quarkiverse/quarkus-openapi-generator/pull/556

[gabriel-farache]

Description

quarkiverse/quarkus-openapi-generator#556 fixed an error that should be integrated to the runtime.

So the openapi generator version should be bumped to the new release that includes the fix.

Implementation ideas

Update version.io.quarkiverse.openapi.generator in kogito-build/kogito-dependencies-bom/pom.xml

[ricardozanini]

Released: quarkiverse/quarkus-openapi-generator#566

@gabriel-farache feel free to open a PR to update to the new version.