crypto_provider: tidy imports

Author: cpu

src/crypto_provider.rs

@@ -1,15 +1,17 @@
+use std::slice;
+use std::sync::Arc;
+
 use libc::size_t;
 use pki_types::pem::PemObject;
 use pki_types::PrivateKeyDer;
+
 #[cfg(feature = "aws-lc-rs")]
 use rustls::crypto::aws_lc_rs;
 #[cfg(feature = "ring")]
 use rustls::crypto::ring;
 use rustls::crypto::CryptoProvider;
 use rustls::sign::SigningKey;
 use rustls::SupportedCipherSuite;
-use std::slice;
-use std::sync::Arc;
 
 use crate::cipher::rustls_supported_ciphersuite;
 use crate::error::map_error;