Fix importing Bitwarden exports

When importing Bitwarden JSON exports, these would fail because the last
modification date was also imported and caused our out-off-sync check to
kick-in. This PR fixes this by checking if we are doing an import, and
skip this check.

Fixes #4005

src/api/core/ciphers.rs

@@ -359,6 +359,8 @@ pub async fn update_cipher_from_data(
     enforce_personal_ownership_policy(Some(&data), headers, conn).await?;
 
     // Check that the client isn't updating an existing cipher with stale data.
+    // And only perform this check when not importing ciphers, else the date/time check will fail.
+    if ut != UpdateType::None {
         if let Some(dt) = data.LastKnownRevisionDate {
             match NaiveDateTime::parse_from_str(&dt, "%+") {
                 // ISO 8601 format
@@ -369,6 +371,7 @@ pub async fn update_cipher_from_data(
                 Ok(_) => (),
             }
         }
+    }
 
     if cipher.organization_uuid.is_some() && cipher.organization_uuid != data.OrganizationId {
         err!("Organization mismatch. Please resync the client before updating the cipher")