Generator: update part-partof test to support new dependencies

Author: greenrobot-team

generator/integration-tests/part-partof/lib/frozen.dart

@@ -4,7 +4,7 @@ import 'package:objectbox/objectbox.dart';
 part 'frozen.freezed.dart';
 
 @freezed
-class FrozenEntity with _$FrozenEntity {
+sealed class FrozenEntity with _$FrozenEntity {
   @Entity(realClass: FrozenEntity)
   factory FrozenEntity(
       {@Id(assignable: true) required int id,
@@ -13,15 +13,15 @@ class FrozenEntity with _$FrozenEntity {
 }
 
 @freezed
-class FrozenPerson with _$FrozenPerson {
+sealed class FrozenPerson with _$FrozenPerson {
   @Entity(realClass: FrozenPerson)
   factory FrozenPerson(
       {@Id(assignable: true) required int id,
       required String name}) = _FrozenPerson;
 }
 
 @freezed
-class FrozenBook with _$FrozenBook {
+sealed class FrozenBook with _$FrozenBook {
   @Entity(realClass: FrozenBook)
   factory FrozenBook(
       {@Id(assignable: true) required int id,

generator/integration-tests/part-partof/pubspec.yaml

@@ -1,25 +1,22 @@
 name: objectbox_generator_test
 
 environment:
-  sdk: '>=2.14.0 <4.0.0'
+  sdk: '^3.0.0' # Require 3.0 to use sealed classes for freezed
 
 dependencies:
   objectbox: any # override below to use local package
   json_annotation: '^4.6.0'
-  freezed_annotation: '^2.1.0'
+  freezed_annotation: '^3.1.0'
 
 dev_dependencies:
-  json_serializable: '^6.3.1'
-  freezed: '^2.0.4' # 3.0.4 requires Dart 3.6
+  json_serializable: '^6.10.0' # Require 6.10.0 to allow build 3 required by objectbox_generator
+  freezed: '^3.0.0' # Require 3.0.0 to allow build 3 and source_gen 3.1 required by objectbox_generator
   objectbox_generator: any # override below to use local package
   test: '^1.21.4'
   build_runner: '^2.3.3'
-  build_test: '^2.1.3'
+  build_test: '^3.0.0'
   io: '^1.0.4'
   path: '^1.8.3'
-  # analyzer 7.4.0 introduced breaking API changes in a minor release, breaking json_serializable
-  # https://github.com/google/json_serializable.dart/issues/1485
-  analyzer: '<=7.3.0'
 
 dependency_overrides:
   objectbox: