update dtos to not use relative paths

Author: mythz

test/dtos/aiserver.dtos.dart

@@ -15,7 +15,7 @@ BaseUrl: https://openai.servicestack.net
 */
 
 import 'dart:typed_data';
-import '../../lib/servicestack.dart';
+import 'package:servicestack/servicestack.dart';
 
 // @DataContract
 enum AudioFormat {

test/dtos/techstacks.dtos.dart

@@ -4,18 +4,18 @@ Version: 8.13
 Tip: To override a DTO option, remove "//" prefix before updating
 BaseUrl: https://techstacks.io
 
-//GlobalNamespace: 
+//GlobalNamespace:
 //AddServiceStackTypes: True
 //AddResponseStatus: False
-//AddImplicitVersion: 
+//AddImplicitVersion:
 //AddDescriptionAsComments: True
-//IncludeTypes: 
-//ExcludeTypes: 
-DefaultImports: dart:typed_data,dart:collection,../../lib/servicestack.dart
+//IncludeTypes:
+//ExcludeTypes:
+DefaultImports: dart:typed_data,dart:collection,package:servicestack/servicestack.dart
 */
 
 import 'dart:typed_data';
-import '../../lib/servicestack.dart';
+import 'package:servicestack/servicestack.dart';
 
 enum PostType {
   Announcement,

test/dtos/test.dtos.dart

@@ -4,17 +4,17 @@ Version: 8.41
 Tip: To override a DTO option, remove "//" prefix before updating
 BaseUrl: https://test.servicestack.net
 
-//GlobalNamespace: 
+//GlobalNamespace:
 //AddServiceStackTypes: True
 //AddResponseStatus: False
-//AddImplicitVersion: 
+//AddImplicitVersion:
 //AddDescriptionAsComments: True
-//IncludeTypes: 
-//ExcludeTypes: 
-DefaultImports: ../../lib/servicestack.dart
+//IncludeTypes:
+//ExcludeTypes:
+DefaultImports: package:servicestack/servicestack.dart
 */
 
-import '../../lib/servicestack.dart';
+import 'package:servicestack/servicestack.dart';
 import 'dart:collection';
 import 'dart:typed_data';
 

test/issues/dartrefsandbox.dtos.dart

@@ -4,17 +4,17 @@ Version: 5.50
 Tip: To override a DTO option, remove "//" prefix before updating
 BaseUrl: http://localhost:5000
 
-//GlobalNamespace: 
+//GlobalNamespace:
 //AddServiceStackTypes: True
 //AddResponseStatus: False
-//AddImplicitVersion: 
+//AddImplicitVersion:
 //AddDescriptionAsComments: True
-//IncludeTypes: 
-//ExcludeTypes: 
-DefaultImports: ../../lib/servicestack.dart
+//IncludeTypes:
+//ExcludeTypes:
+DefaultImports: package:servicestack/servicestack.dart
 */
 
-import '../../lib/servicestack.dart';
+import 'package:servicestack/servicestack.dart';
 
 class FooListDto implements IConvertible {
   String? id;