Merge branch '3344-threadsanitizer-data-race-in-isc__nm_tcpdns_send-v9_16' into 'v9_16'

Move setting the sock->write_timeout to the async_*send [v9.16]

See merge request !6342
85 jobs for v9_16 in 41 minutes and 16 seconds (queued for 3 seconds)