Fix rand breaking changes

src/data/totp_key.rs

@@ -21,7 +21,7 @@ pub struct TotpKey {
 impl TotpKey {
     /// Generate a new TOTP key
     pub fn new_random() -> Self {
-        let random_bytes = rand::thread_rng().gen::<[u8; 20]>();
+        let random_bytes = rand::rng().random::<[u8; 20]>();
         Self {
             encoded: base32::encode(BASE32_ALPHABET, &random_bytes),
         }