fix: Downgrade ompi version to v4.1.5rc2

[krishung5]

What does the PR do?

Downgrade ompi version to avoid ucc issues when running TRT-LLM container on kubernetes.

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• build
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Test plan:

TRT-LLM backend build and tests should be passing.

• CI Pipeline ID: 16512052

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[fpetrini15]

LGTM, thanks for the fix 🚀

[krishung5]

@fpetrini15 FYI - though the TRT-LLM team says there shouldn't be issues for the downgrade, they are still trying to verify if there is any perf regression. Might worth waiting for their verification to merge this in.

[fpetrini15]

Dismissing approval until the TRT-LLM team verifies the fix

[krishung5]

Rebased