yes: drop unused feat deps

Author: oech3

src/uu/yes/Cargo.toml

@@ -22,12 +22,7 @@ path = "src/yes.rs"
 clap = { workspace = true }
 itertools = { workspace = true }
 fluent = { workspace = true }
-
-[target.'cfg(unix)'.dependencies]
-uucore = { workspace = true, features = ["pipes", "signals"] }
-
-[target.'cfg(not(unix))'.dependencies]
-uucore = { workspace = true, features = ["pipes"] }
+uucore = { workspace = true }
 
 [[bin]]
 name = "yes"