[4.13] ironic-proxy is using a deprecated field to fetch cluster VIP

In https://github.com/openshift/cluster-baremetal-operator/blob/master/provisioning/utils.go#L65 we reference .PlatformStatus.BareMetal.APIServerInternalIP attribute from the config API. Meanwhile, a recent change https://github.com/openshift/api/commit/51f399230d604fa013c2bb341040c4ad126e7309 deprecated this field in favour of .APIServerInternalIPs (note plural), this was done to better suit dual stack case.

We need to update the code (trivial) along with vendor dependencies (openshift/api needs a bump to version equal or later to the one including the commit referenced above). Likely there will be code changes required in CBO to adopt to the newer API package.

Slack threads for reference: https://app.slack.com/client/T027F3GAJ/C01RJHA6BRC/thread/C01RJHA6BRC-1661416223.353009 (vendor dependency update)

openshift/api change:
https://coreos.slack.com/archives/C01RJHA6BRC/p1660573560434409?thread_ts=1660229723.998839&cid=C01RJHA6BRC

IMPORTANT NOTE: there is an in-flight PR which is making changes to the CBO code fetching the VIP: https://github.com/openshift/cluster-baremetal-operator/pull/285.

Work done to address this bug needs to be stacked on top of this to avoid duplication of effort (the easiest way is to work on the code from the in-flight PR285 and merge once PR285 merges)

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