Downgrade DNS errors to warnings #19

Job	Run time
Run RustDoc	1m 6s
Run Cargo Deny (advisories)	23s
Run Clippy	32s
Run Cargo Deny (bans licenses sources)	22s
Run Rustfmt	18s
Run Cargo Udeps	1m 14s
Run Cargo Tests	19s
All tests passed	1s
	4m 15s

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