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Check the return value from uv_async_send()

Tony Finch requested to merge 4068-coverity-uv_async_send into main

An omission pointed out by the following report from Coverity:

/lib/isc/loop.c: 483 in isc_loopmgr_pause()
>>>     CID 455002:  Error handling issues  (CHECKED_RETURN)
>>>     Calling "uv_async_send" without checking return value (as is done elsewhere 5 out of 6 times).
483     		uv_async_send(&loop->pause_trigger);

Closes #4068 (closed)

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