message: Remove armor in tests when feature is disabled
  The tests in age/src/encrypted.rs use the armor crate without the usage
  being guarded by a compiler directive. This commit disables said test
  when the armor feature is not enabled.
diff: @@ -215,9 +215,10 @@ mod tests {
  use age_core::secrecy::{ExposeSecret, SecretString};
  use super::Identity;
  - use crate::{
  - armor::ArmoredReader, x25519, Callbacks, DecryptError, Identity as _, Recipient as _,
  - };
  + use crate::{x25519, Callbacks, DecryptError, Identity as _, Recipient as _};
  +
  + #[cfg(feature = "armor")]
  + use crate::armor::ArmoredReader;
  const TEST_ENCRYPTED_IDENTITY_PASSPHRASE: &str = "foobar";
  @@ -260,6 +261,7 @@ fOrxrKTj7xCdNS3+OrCdnBC8Z9cKDxjCGWW3fkjLsYha0Jo=
  }
  #[test]
  + #[cfg(feature = "armor")]
  fn round_trip() {
  let pk: x25519::Recipient = TEST_RECIPIENT.parse().unwrap();
  let file_key = [12; 16].into();
  