fix(security): bump black to 26.3.1 (ENG-12907)

[andriy-sudo]

Summary

Fixes CVE-2026-32274 (GHSA-3936-cmfr-pm3m) in examples/python.

Package	Old	New	Advisory	CVSS	Status
black	* (resolved 25.11.0)	~=26.3.1	GHSA-3936-cmfr-pm3m	HIGH	✅ Fixed

Note: Added python = ">=3.10" marker to the black dependency — black 26.3.1 dropped Python 3.9 support. The project's python = "^3.9" is unchanged as CI already runs Python 3.11.

Closes ENG-12907.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between cacd86b and b2c436d.

⛔ Files ignored due to path filters (1)

• examples/python/poetry.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• examples/python/pyproject.toml

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📝 Walkthrough

Walkthrough

The examples/python/pyproject.toml file was updated to pin the black code formatter dependency to a specific version constraint. The dev dependency for black was changed from an unspecified wildcard version ("*") to version = "~=26.3.1" with a Python version requirement of ">=3.10". This modification provides a more explicit control over which black version is used in the Python examples project.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: a security bump of the black package to version 26.3.1 to address a CVE, which aligns with the file changes and PR objectives.
Description check	✅ Passed	The description is directly related to the changeset, providing context about the security fix (CVE-2026-32274), the version bump, and the Python compatibility marker added to the black dependency.

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch andriy/ENG-12907-fix-black-cve

📝 Coding Plan

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