net-mgmt/p5-Net-CIDR: upgrade 0.19 -> 0.20

• ipcmp: handle comparison of mixed IPv4 and IPv6-specified addresses, allowing cidrlookup() to look up IPv6-mapped IPv4 addresses in IPv4 address ranges, and vice versa.

PR: 237364
Submitted by: John W. O'Brien <john@saltant.com>
Changes: https://metacpan.org/changes/distribution/Net-CIDR