message: fix: crash in MarkdownRenderer on non-string
diff: @@ -129,9 +129,7 @@ export class MarkdownRenderer {
  md.renderer.rules.heading_close = this.headingCloseRule;
  }
  - const text = rawText;
  -
  - const res = md.render(text);
  + const res = md.render(rawText.toString());
  if (!raw) {
  this.restoreOrigRules();
  