Update PolicyEngine UK to 2.79.0

[policyengine]

Summary

Update PolicyEngine UK from 2.78.0 to 2.79.0.

What changed (2.78.0 -> 2.79.0)

Added

• Add named economic-assumption parameters for the local-authority ONS income target uprating factors used by policyengine-uk-data.

Fixed

• Corrected Universal Credit rebalancing so existing health-element claimants keep their combined standard allowance and health element award CPI-protected.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.01%. Comparing base (39d6550) to head (05f814b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3398      +/-   ##
==========================================
+ Coverage   72.97%   73.01%   +0.03%     
==========================================
  Files          56       56              
  Lines        2598     2598              
  Branches      460      460              
==========================================
+ Hits         1896     1897       +1     
  Misses        617      617              
+ Partials       85       84       -1     

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