message: fix: match sourceMappingURL to bundler hard-coded output filename
diff: @@ -75,7 +75,7 @@ export default class BundleRequest {
  this.diagnostics.addAllowedUnusedSuppressionPrefix("lint");
  this.sourceMap = new SourceMapGenerator({
  - path: createPath(this.resolvedEntry.getBasename()),
  + path: createPath("index.js"),
  });
  this.assets = new RelativePathMap();
  