Update Rust crate futures-util to 0.3.31

Reviewed-on: #407

src/data/totp_key.rs

@@ -1,5 +1,3 @@
-use std::io::ErrorKind;
-
 use base32::Alphabet;
 use rand::Rng;
 use totp_rfc6238::{HashAlgorithm, TotpGenerator};
@@ -90,8 +88,7 @@ impl TotpKey {
 
         let key = match base32::decode(BASE32_ALPHABET, &self.encoded) {
             None => {
-                return Err(Box::new(std::io::Error::new(
-                    ErrorKind::Other,
+                return Err(Box::new(std::io::Error::other(
                     "Failed to decode base32 secret!",
                 )));
             }

src/data/webauthn_manager.rs

@@ -1,4 +1,3 @@
-use std::io::ErrorKind;
 use std::sync::Arc;
 
 use actix_web::web;
@@ -109,15 +108,13 @@ impl WebAuthManager {
     ) -> Res<WebauthnPubKey> {
         let state: RegisterKeyOpaqueData = self.crypto_wrapper.decrypt(opaque_state)?;
         if state.user_id != user.uid {
-            return Err(Box::new(std::io::Error::new(
-                ErrorKind::Other,
+            return Err(Box::new(std::io::Error::other(
                 "Invalid user for pubkey!",
             )));
         }
 
         if state.expire < time() {
-            return Err(Box::new(std::io::Error::new(
-                ErrorKind::Other,
+            return Err(Box::new(std::io::Error::other(
                 "Challenge has expired!",
             )));
         }
@@ -157,15 +154,13 @@ impl WebAuthManager {
     ) -> Res {
         let state: AuthStateOpaqueData = self.crypto_wrapper.decrypt(opaque_state)?;
         if &state.user_id != user_id {
-            return Err(Box::new(std::io::Error::new(
-                ErrorKind::Other,
+            return Err(Box::new(std::io::Error::other(
                 "Invalid user for pubkey!",
             )));
         }
 
         if state.expire < time() {
-            return Err(Box::new(std::io::Error::new(
-                ErrorKind::Other,
+            return Err(Box::new(std::io::Error::other(
                 "Challenge has expired!",
             )));
         }