message: Update TEXT_FILE_EXTENSIONS for v9.255
  Closes
diff: @@ -817,6 +817,7 @@ export const TEXT_FILE_EXTENSIONS: Readonly<{
  md: 'text/markdown';
  pdf: 'application/pdf';
  txt: 'text/plain';
  + xml: 'application/xml';
  }>;
  export type TEXT_FILE_EXTENSIONS = ValueOf<typeof TEXT_FILE_EXTENSIONS>;
  