x11/elementary-terminal: Update to 6.0.1

While we're here:

 - Adjust dependencies
 - Fix Meson error, in i18n.merge_file() function, now (meson >= 0.60.1) first optional argument is deprecated
 - Force to use generic font (cosmetic changes)
 - Use procstat(1) instead of /proc through linprocfs(5)
 - Remove dbus-send command (see bug #258674 for full d

PR:	260551