OCPNODE-1619: Bump 4.13 minor_min to 4.12.15

[petr-muller]

Avoid OCPBUGS-11409:

The minimally viable upgrade path to 4.13 would have to be 4.12.15 or later.

[openshift-ci-robot]

@petr-muller: This pull request references OCPNODE-1619 which is a valid jira issue.

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In response to this:

Avoid OCPBUGS-11409:

The minimally viable upgrade path to 4.13 would have to be 4.12.15 or later.

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[petr-muller]

/hold

...but 4.12.15 is not a thing yet :P

[wking]

4.12.15 includes openshift/kubernetes#1478 for OCPBUGS-7589. I'm a bit fuzzy on the relationship between OCPBUGS-7589 and OCPBUGS-11409, but I'll pull the hold, and we can always follow up with later changes if I'm misunderstanding:

/hold cancel
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: petr-muller, wking

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[openshift-ci]

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