message: fix: use correct source for module output
diff: @@ -24,7 +24,7 @@ const plugins = (browserslist, declaration) => [
  const outputs = [
  {
  - input: 'src/index.ts',
  + input: 'src/embed.ts',
  output: {
  file: 'build/vega-embed.module.js',
  format: 'esm',
  