chore: update integrations test for `impit` with mocks for `impit.Response.json` #447

Job	Run time
Docs check / Docs check	1m 6s
Lint check / Lint check (3.11)	10s
Type check / Type check (3.14)	23s
Lint check / Lint check (3.12)	14s
Lint check / Lint check (3.13)	13s
Unit tests / Unit tests (ubuntu-latest, 3.11)	24s
Type check / Type check (3.11)	15s
Type check / Type check (3.12)	13s
Unit tests / Unit tests (windows-latest, 3.11)	1m 16s
Type check / Type check (3.10)	15s
Unit tests / Unit tests (ubuntu-latest, 3.14)	32s
Unit tests / Unit tests (windows-latest, 3.10)	59s
Lint check / Lint check (3.10)	14s
Async dostrings check / Async docstrings check	24s
Unit tests / Unit tests (ubuntu-latest, 3.13)	24s
Type check / Type check (3.13)	13s
Unit tests / Unit tests (ubuntu-latest, 3.12)	26s
Unit tests / Unit tests (windows-latest, 3.12)	41s
Lint check / Lint check (3.14)	23s
Unit tests / Unit tests (windows-latest, 3.13)	50s
Unit tests / Unit tests (windows-latest, 3.14)	38s
Unit tests / Unit tests (ubuntu-latest, 3.10)	26s
Integration tests / Integration tests	0s
	10m 39s

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