refactor: fix some clippy warnings

crates/typst-layout/src/image.rs

@@ -65,7 +65,7 @@ pub fn layout_image(
                 engine.world,
                 &families(styles).map(|f| f.as_str()).collect::<Vec<_>>(),
             )
-            .in_text(&data)?,
+            .in_text(data)?,
         ),
     };
 

crates/typst-syntax/src/source.rs

@@ -63,7 +63,7 @@ impl Source {
 
     /// The whole source as a string slice.
     pub fn text(&self) -> &str {
-        &self.0.lines.text()
+        self.0.lines.text()
     }
 
     /// Slice out the part of the source code enclosed by the range.