build: drop the unused urwid dependencies

Nothing imports urwid or urwid-readline since the interfaces moved to
plain curses, yet every install pulled both in.

pyproject.toml

@@ -21,8 +21,6 @@ classifiers = [
 
 dependencies = [
     "xdg-base-dirs>=6.0.0,<7.0.0",
-    "urwid>=2.1.2,<3.0.0",
-    "urwid-readline>=0.13,<1.0.0",
 ]
 
 [project.optional-dependencies]