build: bump upstream container to 26.06 and ONNX Runtime to 1.27.0

[mc-nv]

What does the PR do?

Bumps the default Triton version map for the Vera Rubin (R100 / R200) build train:
upstream_container_version 26.05 → 26.06 and ort_version 1.24.4 → 1.27.0.

Checklist

• PR title reflects the change and is of format <commit_type>: <Title>
• Changes are described in the pull request.
• Related issues are referenced.
• Populated github labels field
• Added test plan and verified test passes.
• Verified that the PR passes existing CI.
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Commit Type:

• build
• ci
• docs
• feat
• fix
• perf
• refactor
• revert
• style
• test

Related PRs:

triton-inference-server/onnxruntime_backend#347

Where should the reviewer start?

build.py — DEFAULT_TRITON_VERSION_MAP.

Test plan:

Rubin build pipeline on the internal GitLab mirror builds the py3 image set with the
bumped upstream / ORT versions.

• CI Pipeline ID: 56420653

Caveats:

Version-map bump only; no source or behavior change.

Background

Part of Vera Rubin (R100 / R200) CI enablement — aligns the build train with the 26.06
upstream and ONNX Runtime 1.27.0 used by the rubin images.

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• Relates to TRI-1167