message: Fix throughput benchmark after armoring refactor
diff: -use age::{Encryptor, Format, SecretKey};
  +use age::{Encryptor, SecretKey};
  use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
  use criterion_cycles_per_byte::CyclesPerByte;
  use std::io::{self, Write};
  @@ -16,7 +16,7 @@ fn bench(c: &mut Criterion<CyclesPerByte>) {
  group.bench_function(BenchmarkId::new("encrypt", size), |b| {
  let mut output = Encryptor::with_recipients(recipients.clone())
  - .wrap_output(io::sink(), Format::Binary)
  + .wrap_output(io::sink())
  .unwrap();
  b.iter(|| output.write_all(&buf))
  