ci: Fix API doc failure in CI

[sentrivana]

Sphinx 8.2 (see changelog) seems to have broken our CI. Looks like an incompatibility between it and the autodoc-typehints extension, so hopefully the two catch up with one another -- I'll pin sphinx to <8.2 for now.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
22963	1	22962	5844

View the top 1 failed test(s) by shortest run time

tests.integrations.stdlib.test_httplib test_http_timeout

Stack Traces | 0.124s run time

.../integrations/stdlib/test_httplib.py:419: in test_http_timeout
    assert len(transaction["spans"]) == 1
E   assert 0 == 1
E    +  where 0 = len([])

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