community/notcurses: upgrade to 2.3.4

updates notcurses to new 2.3.4 from 2.3.1:

• https://github.com/dankamongmen/notcurses/releases/tag/v2.3.4
• https://github.com/dankamongmen/notcurses/releases/tag/v2.3.2

new binary notcurses-info is installed into notcurses-demo subpackage.