Update PolicyEngine US to 1.634.4

[policyengine]

Summary

Update PolicyEngine US from 1.633.2 to 1.634.4.

What changed (1.633.2 -> 1.634.4)

Added

• Add federal SSI living arrangement statuses and ISM/PMV framework.

Fixed

• Made has_tin the canonical TIN variable while keeping has_itin and taxpayer_has_itin as compatibility aliases during migration.
• Fixed federal and reform CTC gating so child CTC, ODC, and reform overrides all follow the intended child-qualification and filer-identification rules, and introduced has_tin / taxpayer_has_tin compatibility variables for the TIN-side checks.
• Fixed MA LIHEAP expense cap to include fuel oil expenses and bypass cap for heat-in-rent households.
• Gate the federal child CTC amount on ctc_qualifying_child so dependents who fail the child-specific identification requirement no longer receive the $2,000 child amount.

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