textproc/UCD: fix fetch

Patch proposed by Daniel Engberg <diizzy@FreeBSD.org>:

• Only use HTTPS
• Instead of creating a new directory for each release use a subdir
• Grab license file from Unicode Han Database (Unihan) as they share the same and are both part of Unicode.

PR: 260986
Reported by: jbeich

(cherry picked from commit ae1444fdea5a04915a2983eb8b997ffa9a9bead2)