Migrate my_friend_ben fixture off removed medical_out_of_pocket_expenses

policyengine-us 1.673.0 removed the umbrella `medical_out_of_pocket_expenses`
input (PR PolicyEngine/policyengine-us#8178), which decomposed it into
program-specific aggregates with separate premium and non-premium pieces.
Send `other_medical_expenses` instead, the load-bearing replacement for
non-premium medical spending used by every internal program aggregate
(itemized_medical_expenses, snap_allowable_medical_expenses,
hud_medical_expenses, medicaid_medically_needy_medical_expenses,
pa_ccw_medical_expenses, and SPM MOOP).

Without this fix, the my_friend_ben integration test fails with HTTP 500 /
VariableNotFoundError once the package is bumped past 1.672.0.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hua7450

changelog.d/migrate-medical-out-of-pocket-expenses-fixture.changed.md

@@ -0,0 +1 @@
+Migrated the `my_friend_ben` customer-household fixture off the removed `medical_out_of_pocket_expenses` input to `other_medical_expenses`, the load-bearing replacement for non-premium medical spending in policyengine-us 1.673.0+.

tests/data/customer_households/my_friend_ben.py

@@ -111,7 +111,7 @@
             "real_estate_taxes": {
                 "2025": 0,
             },
-            "medical_out_of_pocket_expenses": {
+            "other_medical_expenses": {
                 "2025": 0,
             },
             "is_snap_ineligible_student": {