[ package:dds ] Prepare for 3.0.0 release

- Fixes typo in CHANGELOG.md
- Reverts vm_service version bump to ^12.0.0 as it's not needed for this
  breaking change

Change-Id: Ib9251dac0af4958d72fcb341490643bfe0f7a21a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/331800
Reviewed-by: Derek Xu <[email protected]>
Commit-Queue: Ben Konyi <[email protected]>

Author: bkonyi

pkg/dds/CHANGELOG.md

@@ -1,6 +1,5 @@
 # 3.0.0
-- **Breaking change:** update `vm_service` version to ^13.0.0.
-- **Breaking chnage:** change type of `DartDebugAdapter.vmService` from `VmServiceInterface` to `VmService`.
+- **Breaking change:** change type of `DartDebugAdapter.vmService` from `VmServiceInterface` to `VmService`.
 
 # 2.11.1
 - [DAP] `restartFrameRequest` is now supported for frames up until the first async boundary (that are not also the top frame).

pkg/dds/pubspec.yaml

@@ -28,7 +28,7 @@ dependencies:
   sse: ^4.0.0
   stack_trace: ^1.10.0
   stream_channel: ^2.0.0
-  vm_service: ^13.0.0
+  vm_service: ^12.0.0
   web_socket_channel: ^2.0.0
 
 # We use 'any' version constraints here as we get our package versions from