[Adopters] change adopter of Ant Group

[sperlingxx]

Hi @andreyvelich @gaocegege @johnugeorge @hougangliu ,

For some reasons, I will no longer work as katib adopter for Ant Group in soon time. And I recommend @ohmystack to take over this position, who is the architect and primary contributor of our internal platform.

I am very pleased that I had chance to collaborate with katib community. And I really appreciate for suggestions and code reviews from community, which helps me a lot.

[kubeflow-bot]

This change is 

[sperlingxx]

/retest

[gaocegege]

/lgtm

[andreyvelich]

Thank you @sperlingxx for doing amazing contributions!
Can you make new empty commit to trigger CI and re-run test, please?

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[k8s-ci-robot]

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[sperlingxx]

Thank you @sperlingxx for doing amazing contributions!
Can you make new empty commit to trigger CI and re-run test, please?

This PR was closed accidentially. I have reapplied it at #1327 .