chore: relax HTTPX version upper bound #95

Job	Run time
Lint check / Lint check (3.9)	21s
Async dostrings check / Async docstrings check	24s
Lint check / Lint check (3.10)	17s
Lint check / Lint check (3.11)	16s
Lint check / Lint check (3.12)	19s
Docs check / Docs check	1m 27s
Lint check / Lint check (3.13)	31s
Type check / Type check (3.9)	23s
Unit tests / Unit tests (ubuntu-latest, 3.9)	29s
Type check / Type check (3.10)	27s
Type check / Type check (3.11)	21s
Type check / Type check (3.12)	23s
Unit tests / Unit tests (ubuntu-latest, 3.10)	23s
Type check / Type check (3.13)	39s
Unit tests / Unit tests (ubuntu-latest, 3.11)	21s
Unit tests / Unit tests (ubuntu-latest, 3.12)	27s
Unit tests / Unit tests (ubuntu-latest, 3.13)	38s
Unit tests / Unit tests (windows-latest, 3.9)	46s
Unit tests / Unit tests (windows-latest, 3.10)	1m 16s
Unit tests / Unit tests (windows-latest, 3.11)	1m 13s
Unit tests / Unit tests (windows-latest, 3.12)	1m 7s
Unit tests / Unit tests (windows-latest, 3.13)	2m 29s
Integration tests / Integration tests (3.9)	23s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests (3.13)	33s
Integration tests / Integration tests for PRs from forks	0s
	15m 53s

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