fix(sourcemaps): print source map URL instead of {source_url} on error (#1917)

Author: jbg

src/utils/sourcemaps.rs

@@ -953,8 +953,9 @@ impl SourceMapProcessor {
                             bail!("Invalid embedded sourcemap in source file {source_url}");
                         };
 
-                        let mut sourcemap = SourceMap::from_slice(&decoded)
-                            .context("Invalid embedded sourcemap in source file {source_url}")?;
+                        let mut sourcemap = SourceMap::from_slice(&decoded).with_context(|| {
+                            format!("Invalid embedded sourcemap in source file {source_url}")
+                        })?;
 
                         let debug_id = sourcemap
                             .get_debug_id()