fix: Remove newline from multiple crate versions note

Author: Muscraft

compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs

@@ -1933,7 +1933,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                     StringPart::highlighted("multiple different versions".to_string()),
                     StringPart::normal(" of crate `".to_string()),
                     StringPart::highlighted(format!("{crate_name}")),
-                    StringPart::normal("` in the dependency graph\n".to_string()),
+                    StringPart::normal("` in the dependency graph".to_string()),
                 ],
             );
             if points_at_type {