[BUG] CI: sdist build fails with "Missing dependencies: setuptools==75.3.2"

[danielesalpietro]

Prerequisites

• I have read the MoE-Infinity documentation.
• I have searched the Issue Tracker to ensure this hasn't been reported before.

System Information

CI environment (GitHub-hosted runner), not a local install:

• Runner: ubuntu-22.04
• Python: 3.10.20
• setuptools pinned in pyproject.toml: ==75.3.2
• Workflow: .github/workflows/build-test.yml, .github/workflows/ci-pr.yml
• Build command: python -m build --sdist --no-isolation

Problem Description

Build Test / build and PR Checks / build are currently failing on
every PR at the "Build sdist" step:

Getting build dependencies for sdist...
ERROR Missing dependencies:
    setuptools==75.3.2

The workflow installs setuptools==75.3.2 explicitly before running
python -m build --sdist --no-isolation, but build's dependency
check still reports it as missing. This is unrelated to any specific
PR's diff — pyproject.toml, setup.py, requirements.txt, and
MANIFEST.in are unchanged across affected PRs, so this looks like a
recently introduced fragility (possibly a GitHub-hosted runner image
update — the job logs also show a new "Node.js 20 is deprecated"
warning) around the exact setuptools==75.3.2 pin in
[build-system] requires.

This is currently blocking merges on approved PRs (e.g. #119).

Steps to Reproduce

Code snippets:
N/A — CI-only failure, not reproducible via a Python API call.

Steps to reproduce:

1. Open or update any PR against main/dev.
2. Wait for "Build Test" / "PR Checks" workflows to run.
3. Observe "Build sdist" step fail with the error above.

Expected Behavior

python -m build --sdist --no-isolation succeeds using the pinned
setuptools version, as it did previously.

Additional Context

No response

Usage Statistics (Optional)

No response