Add a pytype error unused-coroutine. #2980

Job	Run time
Python 3.10 MacOS wheels	1m 35s
Python 3.12 MacOS wheels	1m 55s
Python 3.11 MacOS wheels	2m 13s
Python manylinux_2_28_x86_64 wheels(cp310-cp310)	1m 30s
Python manylinux_2_28_x86_64 wheels(cp311-cp311)	1m 21s
Python manylinux_2_28_aarch64 wheels(cp312-cp312)	7m 48s
Python manylinux_2_28_aarch64 wheels(cp310-cp310)	8m 0s
Python manylinux_2_28_aarch64 wheels(cp311-cp311)	7m 58s
Python manylinux_2_28_x86_64 wheels(cp312-cp312)	1m 31s
Merge artifacts	5s
	33m 56s

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