macos: Require macOS 12

[cfergeau]

macOS 14 has been released recently, macOS 11 is likely to become
unsupported soon. This commit officially drops support for macOS 11.

[anjannath]

/test e2e-microshift-crc

[openshift-ci]

@cfergeau: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/integration-crc	7b5ee7d	link	true	/test integration-crc
ci/prow/e2e-crc	7b5ee7d	link	true	/test e2e-crc
ci/prow/e2e-microshift-crc	7b5ee7d	link	true	/test e2e-microshift-crc

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: anjannath, praveenkumar, themr0c

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [anjannath,praveenkumar]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment