Downgrade DNS errors to warnings #25

Job	Run time
Run Rustfmt	17s
Run RustDoc	1m 5s
Run Clippy	33s
Run Cargo Deny (advisories)	22s
Run Cargo Deny (bans licenses sources)	27s
Run Cargo Udeps	1m 18s
Run Cargo Tests	18s
All tests passed	1s
	4m 21s

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