Bump OCP versions: 4.12

[openshift-edge-bot]

OpenShift updates: 4.12.0-rc.2 -> 4.12.0-rc.3
RHCOS updates:

/test edge-e2e-metal-assisted-4-12
/cc @osherdp @gamli75
/hold

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: openshift-edge-bot, osherdp

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[codecov]

Codecov Report

Merging #4741 (b6c1142) into master (fd04808) will decrease coverage by 0.01%.
The diff coverage is 77.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4741      +/-   ##
==========================================
- Coverage   67.45%   67.43%   -0.02%     
==========================================
  Files         201      201              
  Lines       29814    29807       -7     
==========================================
- Hits        20111    20101      -10     
- Misses       7910     7911       +1     
- Partials     1793     1795       +2     

Impacted Files	Coverage Δ
...ler/controllers/preprovisioningimage_controller.go	81.42% <76.19%> (-1.12%)	⬇️
internal/ignition/ironic.go	100.00% <100.00%> (ø)

[osherdp]

/retest

[openshift-ci]

@openshift-edge-bot: all tests passed!

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[osherdp]

/unhold