gh-151749: Add 5f00::/16 (RFC 9602) and 100:0:0:1::/64 (RFC 9780) to ipaddress IPv6 private networks

gh-151749: Add 5f00::/16 (RFC 9602) and 100:0:0:1::/64 (RFC 9780) to ipaddress IPv6 private networks #268795