src: connection: Fix panic when DNS lookup fails

[joaoantoniocardoso]

Closes #218

[danieleades]

@patrickelectric looks like the MSRV job is failing. committing the lockfile would make the build reproducible and prevent these breakages

see https://blog.rust-lang.org/2023/08/29/committing-lockfiles.html

[patrickelectric]

@patrickelectric looks like the MSRV job is failing. committing the lockfile would make the build reproducible and prevent these breakages

see https://blog.rust-lang.org/2023/08/29/committing-lockfiles.html

@danieleades I'll add it