UpdatePort corrupts the host when port digits appear inside the host/IP

[SergoRoberto]

Description

URL.UpdatePort rewrites the port using strings.Replace on the whole host string,
replacing the first match of the port digits instead of the actual port segment.
If the same digits occur inside the IP/hostname, the wrong part gets modified.

Steps to reproduce

u, _ := urlutil.Parse("http://37.228.93.80:80/")
u.UpdatePort("443")
fmt.Println(u.String())

Expected

http://37.228.93.80:443/

Actual

http://37.228.93.8043:80/

Same issue with IPv6, e.g. http://[2001:db8::80]:80/.

Environment

• package: github.com/projectdiscovery/utils/url

PR

#752