chore: promote coredns to v1.12.3

[thevilledev]

Bump CoreDNS version to v1.12.3 (released 2025-08-05).

[k8s-ci-robot]

Hi @thevilledev. Thanks for your PR.

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[thevilledev]

@pacoxu help appreciated! Once this is in I can move the k8s PR from WIP to review.

[johnbelamaric]

/ok-to-test

[pacoxu]

/lgtm
/approve
/assign @johnbelamaric

[pacoxu]

/assign @dims @stp-ip

[stp-ip]

Prepared and executing:

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pacoxu, stp-ip, thevilledev

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