Bump prow from v20201217-2de500de27 to v20201228-15d664642a

[poiana]

Included changes: kubernetes/test-infra@2de500d...15d6646

[poiana]

LGTM label has been added.

Git tree hash: db00c0d0ff78019242761eaf5e115cdec5d2c7b3

[leodido]

Gotta fix the commit author.

Anyways, LGTM

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fntlnz, leodido, maxgio92

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[poiana]

@poiana: Updated the following 2 configmaps:

• job-config configmap in namespace default at cluster default using the following files:
  • key check-prow-config.yaml using file config/jobs/check-prow-config/check-prow-config.yaml
• config configmap in namespace default at cluster default using the following files:
  • key config.yaml using file config/config.yaml

In response to this:

Included changes: kubernetes/test-infra@2de500d...15d6646

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