Fix CI

[sentrivana]

The latest release of httpx seems to have broken the test clients of some older versions of Litestar, Starlite, Anthropic, Langchain, OpenAI, Starlette.

Pinning httpx for old versions.

Also tweaking what versions to test against.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
15166	1	15165	4383

View the top 1 failed tests by shortest run time

tests.integrations.stdlib.test_httplib test_http_timeout

Stack Traces | 60.2s run time

.../integrations/stdlib/test_httplib.py:373: in test_http_timeout
    assert len(transaction["spans"]) == 1
E   assert 6 == 1
E     +6
E     -1

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[antonpirker]

thanks for cleaning that up!