Bump language version for pkg/dds_*

Extracted from https://dart-review.googlesource.com/c/sdk/+/397164
Which migrates the sdk to resolve as a pub workspace

Pub workspaces requires a language version of 3.5.

Change-Id: I74abaac7dec6b88bc0453ef799748c4cbc3026e2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/412084
Auto-Submit: Sigurd Meldgaard <sigurdm@google.com>
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Commit-Queue: Sigurd Meldgaard <sigurdm@google.com>

pkg/dds/CHANGELOG.md

@@ -1,6 +1,7 @@
 # 5.0.1-wip
 
 - Widen the dependency on `package:shelf_web_socket`.
+- Require Dart SDK v. 3.5.0 or higher.
 
 # 5.0.0
 - [DAP] The debug adapter no longer spawns its own in-process copy of DDS, instead relying on one started by the Dart VM (or `Flutter`). This means the `enableDds` and `enableAuthCodes` arguments to the `DartDebugAdapter` base class have been deprecated and have any effect. Suppressing DDS (or auth codes) should be done in launch configuration (for example using `vmAdditionalArgs` or `toolArgs` depending on the target tool).

pkg/dds/lib/src/dds_impl.dart

@@ -388,7 +388,7 @@ class DartDevelopmentServiceImpl implements DartDevelopmentService {
         // If DDS is serving DevTools, install the DevTools handlers and
         // forward any unhandled HTTP requests to the VM service.
         final String buildDir =
-            _devToolsConfiguration!.customBuildDirectoryPath.toFilePath();
+            _devToolsConfiguration.customBuildDirectoryPath.toFilePath();
         return defaultHandler(
           dds: this,
           buildDir: buildDir,

pkg/dds/pubspec.yaml

@@ -6,7 +6,8 @@ description: >-
 repository: https://github.com/dart-lang/sdk/tree/main/pkg/dds
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: ^3.5.0
+
 
 dependencies:
   args: ^2.0.0

pkg/dds_service_extensions/CHANGELOG.md

@@ -1,3 +1,6 @@
+# 2.0.2-wip
+- Require dart sdk v. 3.5.0 or higher.
+
 # 2.0.1
 - Update `vm_service` to `>=14.0.0 <16.0.0`.
 

pkg/dds_service_extensions/pubspec.yaml

@@ -1,12 +1,13 @@
 name: dds_service_extensions
-version: 2.0.1
+version: 2.0.2-wip
 description: >-
   Extension methods for `package:vm_service`, used to make requests a
   Dart Development Service (DDS) instance.
 repository: https://github.com/dart-lang/sdk/tree/main/pkg/dds_service_extensions
 
 environment:
-  sdk: ^3.0.0
+  sdk: ^3.5.0
+
 
 dependencies:
   async: ^2.4.1