message: generator: Fix `clippy::is_digit_ascii_radix`
diff: @@ -1219,7 +1219,7 @@ pub fn variant_ident(enum_name: &str, variant_name: &str) -> Ident {
  let is_digit = new_variant_name
  .chars()
  .next()
  - .map(|c| c.is_digit(10))
  + .map(|c| c.is_ascii_digit())
  .unwrap_or(false);
  if is_digit {
  format_ident!("TYPE_{}", new_variant_name)
  