fix!: ensure that generator clean up is correctly propagated #6061

Job	Run time
mypy	1m 1s
validate	17s
pyright	37s
Test server integration (uvicorn>=0.27.0)	50s
test-platform-compat	0s
slotscheck	21s
Test server integration (uvicorn<0.27.0)	48s
Test Minimal Application with Base Dependencies	22s
test_typing_extensions (4.13.1)	19s
test_typing_extensions (latest)	21s
Test Minimal Pydantic 1 application	28s
test_typing_extensions (4.12.1)	18s
test (3.13) / test	1m 37s
test (3.9) / test	1m 52s
test (3.10) / test	1m 42s
test (3.11) / test	1m 41s
test (3.12) / test	1m 52s
build-docs	2m 50s
test_success	4s
codeql	0s
upload-test-coverage	0s
	17m 20s

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