Update PolicyEngine US to 1.634.12

[policyengine]

Summary

Update PolicyEngine US from 1.634.9 to 1.634.12.

What changed (1.634.9 -> 1.634.12)

Fixed

• Added cited TANF countable-resource formulas and regression tests for DC, Washington, and Montana, while keeping Washington and Montana conservative where CPS cannot distinguish owner-occupied homes from other real property. Also fixed TANF immigration-period handling in monthly eligibility formulas and modeled DC TANF work noncompliance as a partial cash sanction instead of an all-or-nothing eligibility veto.
• Fix state nonrefundable income tax credits to apply in statutory filing order, with state-specific regression coverage for capped credit sequencing.
• Georgia's retirement income exclusion now uses federally loss-limited capital gains and matches the Schedule 1 worksheet by flooring earned income and other retirement income separately before applying the exclusion cap.
• Fix immigration_status period access in monthly eligibility formulas.

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