Allow square brackets in a URL when it's sanitised for a redirect. Square brackets are valid in query parameters and IPv6 addresses.

Fixes #17052
Props voldemortensen

Built from https://develop.svn.wordpress.org/trunk@30683


git-svn-id: http://core.svn.wordpress.org/trunk@30673 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Allow brackets in a URL when it's sanitised for a redirect. Brackets are valid in query parameters.

Fixes #30308
Props voldemortensen

Built from https://develop.svn.wordpress.org/trunk@30684


git-svn-id: http://core.svn.wordpress.org/trunk@30674 1a063a9b-81f0-0310-95a4-ce76da25c4cd