Consume `data` argument in `pdf.embed()` (#6435)

crates/typst-library/src/pdf/embed.rs

@@ -59,7 +59,7 @@ pub struct EmbedElem {
     // We can't distinguish between the two at the moment.
     #[required]
     #[parse(
-        match args.find::<Bytes>()? {
+        match args.eat::<Bytes>()? {
             Some(data) => data,
             None => engine.world.file(id).at(span)?,
         }

tests/suite/pdf/embed.typ

@@ -28,3 +28,7 @@
   mime-type: "text/plain",
   description: "A test file",
 )
+
+--- pdf-embed-invalid-data ---
+// Error: 38-45 expected bytes, found string
+#pdf.embed("/assets/text/hello.txt", "hello")