Downgrade schnorrkel

[jasl]

Substrate still dependent 0.9.1, if the optional schnorrkel enabled, in our case, it make compiles failed

error[E0308]: mismatched types
   --> substrate/primitives/core/src/sr25519.rs:600:33
    |
600 |           let mini_key: MiniSecretKey = mini_secret_from_entropy(entropy, password.unwrap_or(""))
    |  _______________________-------------___^
    | |                       |
    | |                       expected due to this
601 | |             .expect("32 bytes can always build a key; qed");
    | |___________________________________________________________^ expected struct `MiniSecretKey`, found struct `schnorrkel::keys::MiniSecretKey`
    |
    = note: perhaps two different versions of crate `schnorrkel` are being used?