🐛 ipam: fix webhooks using mixed api versions

[schrej]

What this PR does / why we need it:
During the bump of IPAM resources to v1beta1 the version in the kubebuilder:webhook comment was missed which leads to a 'resource not found' error when they are called by the apiserver.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #9860

/area ipam

[sbueringer]

Thx nice catch.

Risk of having no test coverage in core CAPI I guess :/

/lgtm
/approve

/cherry-pick release-1.6

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.6 in a new PR and assign it to you.

In response to this:

Thx nice catch.

Risk of having no test coverage in core CAPI I guess :/

/lgtm
/approve

/cherry-pick release-1.6

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: d86f90582b7d3719cee517bf855a4db92e646468

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #9863

In response to this:

Thx nice catch.

Risk of having no test coverage in core CAPI I guess :/

/lgtm
/approve

/cherry-pick release-1.6

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.