[CI] Install http extra in cibuildwheel test phase

tests/python/test_http.py imports fastapi, which lives in the http
extra. Add it to test-extras so the cibuildwheel test venv resolves
the import.

Author: DaoTwenty

pyproject.toml

@@ -57,7 +57,7 @@ wheel.exclude    = ["midigpt/osc/studio*"]
 build         = "cp310-* cp311-* cp312-*"
 skip          = "*-musllinux_* *-win32 *-manylinux_i686"
 build-verbosity = 1
-test-extras   = ["inference"]
+test-extras   = ["inference", "http"]
 test-requires = "pytest"
 test-command  = 'pytest {project}/tests/python -m "not slow and not inference"'