refactor: remove unused error variant

CHANGELOG.md

@@ -21,6 +21,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - New `source` command for scene items.
   - New `InputSettingsChanged` and `SourceFilterSettingsChanged` event.
 
+### Removed
+
+- **BREAKING CHANGE:** Removed the `Error::NoPassword` variant, which was a relic from the previous v4.x API of obs-websocket. The new API doesn't provide any way to tell whether the password is the cause of an authentication error. However, the `WebSocketCloseCode::AuthenticationFailed` is the closest to identifying this error.
+
 ## [0.11.5] - 2023-09-04
 
 ### Changed

src/lib.rs

@@ -89,9 +89,6 @@ pub enum Error {
         /// Optional message to provide additional details about the error.
         message: Option<String>,
     },
-    /// The obs-websocket API requires authentication but no password was given.
-    #[error("authentication required but no password provided")]
-    NoPassword,
     /// Unknown flags were found while trying to parse bitflags.
     #[error("value {0} contains unknown flags")]
     UnknownFlags(u8),