Dart: Bump leaf package versions

Review URL: https://codereview.chromium.org/1991813002 .

mojo/dart/packages/mojo/CHANGELOG.md

diff --git a/mojo/dart/packages/mojo/CHANGELOG.md b/mojo/dart/packages/mojo/CHANGELOG.md
index c79145c..36fd579 100644
--- a/mojo/dart/packages/mojo/CHANGELOG.md
+++ b/mojo/dart/packages/mojo/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.4.22
+
+  - 22 changes: https://github.com/domokit/mojo/compare/12d71ee...f56fd59
+
+  MOJO_SDK: f56fd59ec51e1ecdd52fb848ceff1b6b6fe7f7fa
+
 ## 0.4.21
 
   - 35 changes: https://github.com/domokit/mojo/compare/e95b5db...c200560

mojo/dart/packages/mojo/pubspec.yaml

diff --git a/mojo/dart/packages/mojo/pubspec.yaml b/mojo/dart/packages/mojo/pubspec.yaml
index 1c02cba..ab2202a 100644
--- a/mojo/dart/packages/mojo/pubspec.yaml
+++ b/mojo/dart/packages/mojo/pubspec.yaml
@@ -2,4 +2,4 @@
 description: Dart files to support executing inside Mojo.
 homepage: https://github.com/domokit/mojo
 name: mojo
-version: 0.4.21
+version: 0.4.22

mojo/dart/packages/mojo_services/CHANGELOG.md

diff --git a/mojo/dart/packages/mojo_services/CHANGELOG.md b/mojo/dart/packages/mojo_services/CHANGELOG.md
index 2b653f5..9a824fe 100644
--- a/mojo/dart/packages/mojo_services/CHANGELOG.md
+++ b/mojo/dart/packages/mojo_services/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.4.29
+
+  - 22 changes: https://github.com/domokit/mojo/compare/12d71ee...f56fd59
+
+  MOJO_SDK: f56fd59ec51e1ecdd52fb848ceff1b6b6fe7f7fa
+
 ## 0.4.28
 
   - 35 changes: https://github.com/domokit/mojo/compare/e95b5db...c200560

mojo/dart/packages/mojo_services/pubspec.yaml

diff --git a/mojo/dart/packages/mojo_services/pubspec.yaml b/mojo/dart/packages/mojo_services/pubspec.yaml
index 0511faf..dfa4a85 100644
--- a/mojo/dart/packages/mojo_services/pubspec.yaml
+++ b/mojo/dart/packages/mojo_services/pubspec.yaml
@@ -4,4 +4,4 @@
 description: Generated bindings for mojo services
 homepage: https://github.com/domokit/mojo
 name: mojo_services
-version: 0.4.28
+version: 0.4.29