update vllm image for 2.12

[rpancham]

Update vllm stable image for 2.12

[rpancham]

/ok-to-test

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[openshift-ci]

@rpancham: The following test 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/images	dd6acc5	link	unknown	/test images

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