Update billing.py #63

Job	Run time
Pyright	22s
Build wheel, install & smoke test	20s
pip-audit (dependency CVEs)	23s
Tests (py3.11)	1m 14s
Tests (py3.13)	1m 14s
Ruff (lint + format)	18s
Tests (py3.12)	1m 12s
	5m 3s

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