Bump OCP versions: 4.13, 4.12

[rccrdpccl]

OpenShift updates: 4.12.27-multi -> 4.12.28-multi, 4.12.27 -> 4.12.28, 4.13.6-multi -> 4.13.8-multi, 4.13.6 -> 4.13.8
RHCOS updates:

/test edge-e2e-metal-assisted-4-13 edge-e2e-metal-assisted-4-12
/cc @osherdp @gamli75

[codecov]

Codecov Report

Merging #5421 (a7de620) into master (1eebf11) will increase coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5421      +/-   ##
==========================================
+ Coverage   67.63%   67.65%   +0.01%     
==========================================
  Files         227      227              
  Lines       33427    33427              
==========================================
+ Hits        22610    22614       +4     
+ Misses       8780     8778       -2     
+ Partials     2037     2035       -2     

see 2 files with indirect coverage changes

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gamli75, rccrdpccl

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 1eebf11 and 2 for PR HEAD a7de620 in total

[openshift-ci]

@rccrdpccl: all tests passed!

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