chore: add X402_PAYMENT_REQUIRED to the ERROR_TYPE enum #424

Job	Run time
PR title check	3s
Docstrings checks / Docstrings checks	12s
Code checks / Spell check	7s
Code checks / Actions lint check	34s
Tests / Integration tests (3.11, ubuntu-latest)	2m 18s
Doc checks / Doc checks / Docs check	1m 21s
Tests / Integration tests (3.14, ubuntu-latest)	2m 31s
Code checks / Type check / Type check (3.13)	11s
Code checks / Type check / Type check (3.11)	10s
Code checks / Type check / Type check (3.12)	10s
Code checks / Type check / Type check (3.14)	15s
Code checks / Lint check / Lint check (3.12)	11s
Code checks / Lint check / Lint check (3.14)	12s
Code checks / Lint check / Lint check (3.13)	14s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 5s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	42s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	43s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	52s
Code checks / Lint check / Lint check (3.11)	10s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	40s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	59s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	56s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	41s
	15m 17s

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