chore(deps): update policyengine to 6.7.0

[policyengine]

Fixes #821

Summary

Update policyengine.py from 6.6.0 to 6.7.0 in the simulation API runtime.

The policyengine[models] requirement selects the runtime versions bundled by policyengine.py 6.7.0:

• policyengine-core: 3.33.0
• policyengine-us: 2.2.1
• policyengine-uk: 2.130.1
• spm-calculator: 1.0.0

The bundle also selects these certified data releases:

• US: populace-us-2024-spm-20260915
• UK: policyengine-uk-data-1.58.1

UK release identity:

• certified dataset SHA-256: 056e80fd8e9151d78f432a25cde863340baee81304c6216a37fb575ce8563784
• certificate digest (receipt v1): 565727f064cf6afb44782b69e4ba69bf872257828e6fa19e1edda59d2a876cae
• release dispatch verified against the installed wheel: true
• qualification: none recorded

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[MaxGhenis]

Deployed. Run 38963410041 completed successfully, with every job passing. The prod "Verify deployed three-service stack" step found the entrypoint serving:

• policyengine 6.7.0, from policyengine-simulation-py6-7-0;
• policyengine-uk 2.130.1;
• UK dataset 056e80fd8e9151d78f432a25cde863340baee81304c6216a37fb575ce8563784, as latest.

It reproduced the numerical release sentinel for that bundle.

Before merging, I checked the diff moves only the policyengine pin (6.6.0 → 6.7.0). The locked wheel sha256 (e49f2861…) matches PyPI, and the UK certified pair is unchanged.

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