databases/libnusqlite3: Update to 1.18

[ahze]

Summary

Adds unicode 18.0.0 character set support.

Changelog: https://bitbucket.org/alekseyt/nunicode/src/1.18/CHANGELOG

Approved by: acm, dtxdf (mentors)

[dtxdf]

databases/libnusqlite3/pkg-descr

1–2

If this is important to the end user, you can move it to pkg-message.

And instead of updating the field for each update, you can reference the table (I mean the URL): https://bitbucket.org/alekseyt/nunicode/src/master/#markdown-header-different-versions-of-unicode

[ahze]

Make pkg-descr version-agnostic, as suggested by dtxdf