Update PolicyEngine UK to 2.88.41

[policyengine]

Summary

Update PolicyEngine UK from 2.88.20 to 2.88.41.

What changed (2.88.20 -> 2.88.41)

Fixed

• Fix property_purchased default from True to False so households are not charged stamp duty on their entire property wealth unless they explicitly purchased this year. The True default charged every household in population datasets full SDLT/LBTT/LTT on its home value, inflating the first income decile's effective tax rate to 251% and breaking the data pipeline.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.89%. Comparing base (d36050d) to head (3471d99).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3652   +/-   ##
=======================================
  Coverage   78.89%   78.89%           
=======================================
  Files          72       72           
  Lines        4241     4241           
  Branches      787      787           
=======================================
  Hits         3346     3346           
  Misses        691      691           
  Partials      204      204           

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