Move to Flutter 3.47, use the improvements that come with this (#64)

Reviewed-on: #64

lib/models/requests/set_account_data.dart

@@ -1,14 +1,16 @@
 import "package:freezed_annotation/freezed_annotation.dart";
+
 part "set_account_data.freezed.dart";
 part "set_account_data.g.dart";
 
-@freezed
-abstract class SetAccountDataRequest with _$SetAccountDataRequest {
-  const factory SetAccountDataRequest({
-    required String type,
-    required dynamic content,
-    String? roomId,
-  }) = _SetAccountDataRequest;
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const SetAccountDataRequest({
+  required final String type,
+  required final dynamic content,
+  final String? roomId,
+}) with _$SetAccountDataRequest {
+  Map<String, Object?> toJson() => _$SetAccountDataRequestToJson(this);
 
   factory SetAccountDataRequest.fromJson(Map<String, Object?> json) =>
       _$SetAccountDataRequestFromJson(json);