chore: add X402_PAYMENT_REQUIRED to the ERROR_TYPE enum #431

Job	Run time
PR title check	5s
Docstrings checks / Docstrings checks	13s
Code checks / Spell check	6s
Code checks / Actions lint check	30s
Tests / Integration tests (3.14, ubuntu-latest)	2m 23s
Tests / Integration tests (3.11, ubuntu-latest)	2m 14s
Doc checks / Doc checks / Docs check	1m 22s
Code checks / Lint check / Lint check (3.14)	15s
Code checks / Lint check / Lint check (3.12)	11s
Code checks / Type check / Type check (3.12)	11s
Code checks / Type check / Type check (3.14)	15s
Code checks / Lint check / Lint check (3.11)	10s
Code checks / Type check / Type check (3.13)	13s
Code checks / Type check / Type check (3.11)	12s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	38s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 3s
Code checks / Lint check / Lint check (3.13)	14s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	37s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	44s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	58s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 4s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	59s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	42s
	15m 19s

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