chore: bump app version to v4.2.1

lib/constants/app_info.dart

@@ -3,8 +3,8 @@ import 'package:flutter/foundation.dart';
 /// App version and info constants
 /// Update version here only - all other files will reference this
 class AppInfo {
-  static const String version = '4.2.0';
-  static const String buildNumber = '121';
+  static const String version = '4.2.1';
+  static const String buildNumber = '122';
   static const String fullVersion = '$version+$buildNumber';
 
   /// Shows "Internal" in debug builds, actual version in release.

pubspec.yaml

@@ -1,7 +1,7 @@
 name: spotiflac_android
 description: Download Spotify tracks in FLAC from Tidal, Qobuz & Deezer
 publish_to: "none"
-version: 4.2.0+121
+version: 4.2.1+122
 
 environment:
   sdk: ^3.10.0