Dockerfile.ubi: add missing dependency

[dtrifiro]

requirements-adag.txt (required for ray accelerated dag) is required as part of of requirements-dev.txt -> requirements-test.txt

[openshift-ci]

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[openshift-ci]

@dtrifiro: 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/smoke-test	b94ac66	link	true	/test smoke-test

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[dtrifiro]

Waiting on a new vllm-tgis-adapter release(see opendatahub-io/vllm-tgis-adapter#82)

Waiting on #126

[dtrifiro]

Smoke test is failing because #126 is missing. Merging this and retriggering CI for #126