Updated cert-manager API version

[jonathansp]

What this PR does / why we need it:

Updates deprecated cert-manager API versions.

Which issue(s) this PR fixes:

Fixes #3887

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[seldondev]

Hi @jonathansp. Thanks for your PR.

I'm waiting for a SeldonIO or todo member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[seldondev]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To complete the pull request process, please assign rafalskolasinski
You can assign the PR to them by writing /assign @rafalskolasinski in a comment when ready.

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[jonathansp]

/assign @RafalSkolasinski

[jonathansp]

cc @cliveseldon

[ukclivecox]

/test notebooks

[ukclivecox]

/test notebooks

[jonathansp]

@cliveseldon @RafalSkolasinski CI step Docs Test / docs-build (pull_request) has failed, but it seems to be unrelated to the PR changes.

[ukclivecox]

Thanks. Looks good. @jonathansp