build.rs: fix "does not live long enough" error

caused by the phf_codegen update

build.rs

@@ -53,7 +53,7 @@ pub fn main() {
     let mut phf_map = phf_codegen::OrderedMap::<&str>::new();
     for krate in &crates {
         let map_value = format!("({krate}::uumain, {krate}::uu_app)");
-        phf_map.entry(krate, &map_value);
+        phf_map.entry(krate, map_value);
     }
     write!(mf, "{}", phf_map.build()).unwrap();
     mf.write_all(b"\n}\n").unwrap();