Don't throw CancelError if ipv6 resolves first

[Richienb]

Fixes #69

[doutatsu]

Anything I can do to help @Richienb? Would love to get this one sorted, as it's been polluting my error logs for awhile now 😫

[Richienb]

@doutatsu Sure, let's collab. If you want, open a pr to https://github.com/Richienb/public-ip/tree/main-1 that adds mocks which cause the ipv4 promise to stall and the ipv6 promise to succeed, then test if its return value is as expected (like in the current tests which imply that no error is thrown).

[doutatsu]

I decided to rollback instead for now, as I am a bit swamped to try and look into fixing this.

[sindresorhus]

Bump :)

[Richienb]

Relatively confident this will work but don't have ipv6 to test it