switched openapi generator to latest v5.1.0

[yliaog]

Fixes https://github.com/kubernetes-client/python/issues/1421

latest openapi generator release is v5.1.0 (https://github.com/OpenAPITools/openapi-generator)

[yliaog]

/cc @roycaihw

[yliaog]

/hold

[roycaihw]

Thanks for holding. I'd like to keep our in-flight v17 Python client releases using the same client generator version. It would be great if we can merge this after we have a stable v17 release.

But technically we should be able to configure the value in the Python repo, so we can merge this if other clients need this.

[roycaihw]

/lgtm

[brendandburns]

/approve

But I think the best practice is for each client library to specify their own commit hash so that the behavior is deterministic per-library.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, yliaog

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-client/gen/blob/master/OWNERS)~~ [brendandburns,yliaog] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[brendandburns]

/hold remove

[brendandburns]

/remove-hold

[brendandburns]

/hold

[brendandburns]

@roycaihw let me know when this is ready to merge (or just un-hold it yourself)

[yue9944882]

+1 bumping generator for java

[roycaihw]

/hold cancel

Sorry for the late reply. The python client release doesn't block this.