fix: Remove extra sleep in `ImpitHttpClient.stream` #726

Job	Run time
PR title check	5s
Checks / Package check	30s
Checks / Actions lint check	45s
Checks / Spell check	6s
Checks / Lint check / Lint check (3.10)	30s
Checks / Type check / Type check (3.11)	30s
Checks / Lint check / Lint check (3.13)	33s
Checks / Lint check / Lint check (3.14)	30s
Checks / Unit tests / Unit tests (windows-latest, 3.10)	6m 35s
Checks / Lint check / Lint check (3.12)	41s
Checks / Type check / Type check (3.14)	31s
Checks / Doc check / Docs check	1m 55s
Checks / Lint check / Lint check (3.11)	35s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.10)	5m 4s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.13)	5m 18s
Checks / Type check / Type check (3.13)	47s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.14)	3m 55s
Checks / Unit tests / Unit tests (macos-latest, 3.13)	3m 49s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.11)	5m 16s
Checks / Unit tests / Unit tests (windows-latest, 3.11)	7m 45s
Checks / Unit tests / Unit tests (macos-latest, 3.14)	6m 7s
Checks / Unit tests / Unit tests (macos-latest, 3.12)	5m 30s
Checks / Unit tests / Unit tests (windows-latest, 3.14)	5m 35s
Checks / Unit tests / Unit tests (windows-latest, 3.12)	6m 41s
Checks / Type check / Type check (3.12)	32s
Checks / Type check / Type check (3.10)	31s
Checks / Unit tests / Unit tests (windows-latest, 3.13)	6m 54s
Checks / Unit tests / Unit tests (macos-latest, 3.10)	6m 23s
Checks / Unit tests / Unit tests (macos-latest, 3.11)	3m 58s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 45s
	1h 33m 36s

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