chore(deps-dev): bump ruff from 0.15.20 to 0.15.21

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[github-actions]

AI Risk Manager

• Decision: review_required
• Headline: Run a focused 10-minute risk review before merge; risk score 38.
• Risk score: 38/100
• Scope: impacted
• Changed files: 1
• PR delta: new=1, resolved=1, unchanged=0
• Support: l2 / supported / ci=advisory
• Profiles: code_risk:supported, ui_flow_risk:not_applicable, business_invariant_risk:not_applicable

Review Focus

• Review dependency drift and validate changed runtime behavior with focused tests.

Top Risks

• [medium] [new] pr_dependency_change_without_test_delta at pyproject.toml: PR changes dependency boundaries without any test delta. Trust: moderate (0.75). Action: Resolve the dependency set, run the package vulnerability audit, and execute focused compatibility tests for the affected integration.

Suppression Hints

If a finding is intentional, add one of these entries to .airiskignore:

- key: "pr_dependency_change_without_test_delta:pyproject.toml:sig:pr-risk:deps-without-tests:pyproject.toml"

Test First

• [medium] pr_dependency_change_without_test_delta at pyproject.toml (4 min): Resolve the dependency set, run the package vulnerability audit, and execute focused compatibility tests for the affected integration.

Full details: see pr_summary.json, merge_triage.md, report.md, findings.json, and test_plan.json.