Remove unused dependencies (uu* are not used, bytes is already there as it printbox already requires 4.03)

Author: kit-ty-kate

src/dune

@@ -1,9 +1,5 @@
-
 (library
   (name printbox)
   (public_name printbox)
   (wrapped false)
-  (flags :standard -warn-error -a+8 -safe-string)
-  (libraries bytes uutf uucp))
-
-
+  (flags :standard -warn-error -a+8 -safe-string))