fix!: ensure that generator clean up is correctly propagated #6062

Job	Run time
validate	20s
mypy	1m 2s
pyright	37s
test_typing_extensions (4.12.1)	19s
slotscheck	18s
Test server integration (uvicorn<0.27.0)	1m 2s
test_typing_extensions (latest)	19s
Test server integration (uvicorn>=0.27.0)	53s
test_typing_extensions (4.13.1)	19s
Test Minimal Application with Base Dependencies	19s
Test Minimal Pydantic 1 application	32s
test (3.9) / test	1m 59s
test (3.11) / test	1m 42s
test (3.10) / test	1m 49s
test (3.13) / test	1m 44s
test (3.12) / test	1m 54s
test-platform-compat	-2s
build-docs	2m 50s
test_success	3s
codeql	0s
upload-test-coverage	0s
	17m 59s

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