Mark `use_neon_speech` as deprecated #625

Job	Run time
unit_tests (3.7)	4m 15s
unit_tests (3.8)	4m 30s
unit_tests (3.9)	4m 26s
py_build_tests / py_build_tests	8s
py_build_tests / relative_path_tests	5s
docker_build_tests / docker_build_tests	35m 6s
	48m 30s

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