Maybe fix DNS leaks #29

Job	Run time
sqlx_test	1m 4s
static_analysis	34s
bdk_test	8m 18s
build (x86_64-unknown-linux-gnu, ubuntu-latest)	2m 44s
test (ubuntu-latest)	11m 4s
build (armv7-unknown-linux-gnueabihf, ubuntu-latest)	2m 45s
docker_tests (happy_path)	3m 59s
build (x86_64-apple-darwin, macos-latest)	2m 26s
docker_tests (happy_path_restart_bob_after_xmr_locked)	3m 53s
build (x86_64-pc-windows-msvc, windows-latest)	2m 32s
test (macos-latest)	11m 28s
docker_tests (happy_path_restart_bob_before_xmr_locked)	3m 41s
docker_tests (happy_path_restart_alice_after_xmr_locked)	3m 40s
docker_tests (alice_and_bob_refund_using_cancel_and_refund_command)	6m 33s
docker_tests (alice_and_bob_refund_using_cancel_then_refund_command)	6m 34s
docker_tests (alice_and_bob_refund_using_cancel_and_refund_command_timelock_not_expired)	6m 33s
docker_tests (punish)	3m 24s
docker_tests (alice_punishes_after_restart_bob_dead)	6m 19s
docker_tests (alice_manually_punishes_after_bob_dead)	6m 34s
docker_tests (alice_refunds_after_restart_bob_refunded)	5m 34s
docker_tests (ensure_same_swap_id)	5m 15s
docker_tests (concurrent_bobs_before_xmr_lock_proof_sent)	5m 25s
docker_tests (alice_manually_redeems_after_enc_sig_learned)	6m 34s
	1h 56m 53s

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