Dart: Update mojo_sdk package version

Review URL: https://codereview.chromium.org/1980563003 .
diff --git a/mojo/dart/packages/mojo_sdk/CHANGELOG.md b/mojo/dart/packages/mojo_sdk/CHANGELOG.md
index cff0585..58650aa 100644
--- a/mojo/dart/packages/mojo_sdk/CHANGELOG.md
+++ b/mojo/dart/packages/mojo_sdk/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.2.25
+
+  - 32 changes: https://github.com/domokit/mojo/compare/c7c9fc0...12d71ee
+
+  MOJO_SDK: 12d71ee39a0af5940e1ec6807702bd05e2f3c236
+
 ## 0.2.24
 
   - 125 changes: https://github.com/domokit/mojo/compare/e4d03ca...e95b5db
diff --git a/mojo/dart/packages/mojo_sdk/pubspec.yaml b/mojo/dart/packages/mojo_sdk/pubspec.yaml
index 6307524..ad34297 100644
--- a/mojo/dart/packages/mojo_sdk/pubspec.yaml
+++ b/mojo/dart/packages/mojo_sdk/pubspec.yaml
@@ -1,8 +1,8 @@
 author: Chromium Authors <mojo-dev@googlegroups.com>
 dependencies:
-  mojo: 0.4.20
-  mojo_services: 0.4.27
+  mojo: 0.4.21
+  mojo_services: 0.4.28
 description: A meta package for the Dart Mojo SDK
 homepage: https://github.com/domokit/mojo
 name: mojo_sdk
-version: 0.2.24
+version: 0.2.25