message: neqo-client: Use h3-29 by default
  This will fix http3 test on interop runner
diff: @@ -62,7 +62,7 @@ type Res<T> = Result<T, ClientError>;
  about = "A basic QUIC HTTP/0.9 and HTTP3 client."
  )]
  pub struct Args {
  - #[structopt(short = "a", long, default_value = "h3-28")]
  + #[structopt(short = "a", long, default_value = "h3-29")]
  /// ALPN labels to negotiate.
  ///
  /// This client still only does HTTP/3 no matter what the ALPN says.
  