refactor!: Remove deprecated methods (#1583)

# Description

Closes #1453.

### Migration instructions

See #1352 and #1443

Author: Gustl22

packages/audioplayers/lib/src/global_audio_scope.dart

@@ -1,6 +1,5 @@
 import 'dart:async';
 
-import 'package:audioplayers/src/audio_log_level.dart';
 import 'package:audioplayers/src/audio_logger.dart';
 import 'package:audioplayers_platform_interface/audioplayers_platform_interface.dart';
 
@@ -16,10 +15,6 @@ class GlobalAudioScope {
       .where((event) => event.eventType == GlobalAudioEventType.log)
       .map((event) => event.logMessage!);
 
-  @Deprecated('Use `AudioLogger.logLevel` instead. '
-      'This will be removed in v5.0.0.')
-  AudioLogLevel get logLevel => AudioLogger.logLevel;
-
   GlobalAudioScope() {
     eventStream = _platform.getGlobalEventStream();
     onLog.listen(
@@ -28,35 +23,6 @@ class GlobalAudioScope {
     );
   }
 
-  @Deprecated('Set `AudioLogger.logLevel` instead. '
-      'This will be removed in v5.0.0.')
-  Future<void> changeLogLevel(AudioLogLevel level) async {
-    AudioLogger.logLevel = level;
-  }
-
-  @Deprecated('Use `AudioLogger.log()` or `AudioLogger.error()` instead. '
-      'This will be removed in v5.0.0.')
-  void log(AudioLogLevel level, String message) {
-    if (level == AudioLogLevel.info) {
-      AudioLogger.log(message);
-    } else if (level == AudioLogLevel.error) {
-      AudioLogger.error(message);
-    }
-  }
-
-  @Deprecated('Use `AudioLogger.log()` instead. '
-      'This will be removed in v5.0.0.')
-  void info(String message) => AudioLogger.log(message);
-
-  @Deprecated('Use `AudioLogger.error()` instead. '
-      'This will be removed in v5.0.0.')
-  void error(String message) => AudioLogger.error(message);
-
   Future<void> setAudioContext(AudioContext ctx) =>
       _platform.setGlobalAudioContext(ctx);
-
-  @Deprecated('Use `setAudioContext()` instead. '
-      'This will be removed in v5.0.0.')
-  Future<void> setGlobalAudioContext(AudioContext ctx) =>
-      _platform.setGlobalAudioContext(ctx);
 }