Downgrade DNS errors to warnings #20

Job	Run time
Run Cargo Udeps	1m 13s
Run Clippy	34s
Run RustDoc	1m 0s
Run Cargo Deny (advisories)	23s
Run Cargo Deny (bans licenses sources)	22s
Run Rustfmt	16s
Run Cargo Tests	18s
All tests passed	1s
	4m 7s

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