gh-135500: Use ipaddress.ip_address instead of regex to detect IPv4 string in http.cookiejar

[LamentXU123]

PR for #135500

discuss post on Disclosure: https://discuss.python.org/t/support-ipv6-in-http-cookiejar-when-deciding-whether-a-string-is-a-hdn-or-a-ip-addr/95439

Changing the regex detection into is _ip()which useipaddress.ip_address().

• Issue: Use ipaddress.ip_address instead of regex to detect IPv4 string in http.cookiejar #135500

[LamentXU123]

Well IMO, using ipaddress.ip_address is a better way to help us detect the IP string, either IPv4 and IPv6. It has a more precise judging method than regex. I think this could help us cope with possible bugs concerning false detections that consider IP string as a HDN which could lead to another comparing logic when Policy are dealing with banned domains. Note that ipaddress.ip_address will not cause a noticeable performance decline.