Dockerfile*.ubi: bump python to 3.12

[dtrifiro]

following upstream's vllm-project#8133

[dtrifiro]

Requires to be merged along with openshift/release#56778

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dtrifiro, NickLucche

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[openshift-ci]

@dtrifiro: 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/rocm-pr-image-mirror	91c4c51	link	true	/test rocm-pr-image-mirror
ci/prow/cuda-pr-image-mirror	91c4c51	link	true	/test cuda-pr-image-mirror
ci/prow/smoke-test	91c4c51	link	true	/test smoke-test
ci/prow/images	91c4c51	link	true	/test images

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