chore(deps): update policyengine to 6.6.0

[policyengine]

Fixes #819

Summary

Update policyengine.py from 6.5.0 to 6.6.0 in the simulation API runtime.

The policyengine[models] requirement selects the runtime versions bundled by policyengine.py 6.6.0:

• 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): f0f3e20addf9264934d9caab58154480ec7276b70cc084c583bc019002c03adf
• release dispatch verified against the installed wheel: true
• qualification: none recorded

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[MaxGhenis]

Deployed. Run 38954965548 completed successfully through beta and prod. In prod's "Verify deployed three-service stack" step, the entrypoint served:

• policyengine 6.6.0, from policyengine-simulation-py6-6-0;
• policyengine-uk 2.130.1;
• UK dataset 056e80fd8e9151d78f432a25cde863340baee81304c6216a37fb575ce8563784, as latest.

These are the expected release identity. The same step reproduced the numerical release sentinel computed from the installed bundle. The Cloud Run promotion, the routing finalization and the removal of superseded revisions all succeeded.

Before merging, I checked that the diff moves only the policyengine pin, from 6.5.0 to 6.6.0. The locked wheel sha256 (1a4aac69…) matches PyPI. The UK certified pair is unchanged from 6.5.0: policyengine-uk 2.130.1, uk-data 1.58.1.

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