Have a more robust check for rinfo.family

[dadepo]

As reported on discord here in node version 18 on MacOS, the value of rinfo.family was an integer type 4.

Even though the documentation here states the value should be of type string with value being either 'ipv4' or 'ipv6'. Clearly this is not the case as I was also able to confirm the issue.

This PR makes the check for rinfo.family more robust such that it does not fail in this observed mismatch between documentation and behaviour of node/os version.