🌱 bump kubeconform to v0.6.7

[tuminoid]

Bump manifestlint's kubeconform image to v0.6.7.

There are no failures in target repos due to bump, will not backport the bump to release branches.

[metal3-io-bot]

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[tuminoid]

Related project-infra PR: metal3-io/project-infra#948

[tuminoid]

/override metal3-centos-e2e-integration-test-main metal3-ubuntu-e2e-integration-test-main

[metal3-io-bot]

@tuminoid: Overrode contexts on behalf of tuminoid: metal3-centos-e2e-integration-test-main, metal3-ubuntu-e2e-integration-test-main

In response to this:

/override metal3-centos-e2e-integration-test-main metal3-ubuntu-e2e-integration-test-main

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