release test_core/test with json reporter updates (#1540)

diff --git a/pkgs/test/CHANGELOG.md b/pkgs/test/CHANGELOG.md
index 7670cea..b79ca30 100644
--- a/pkgs/test/CHANGELOG.md
+++ b/pkgs/test/CHANGELOG.md
@@ -1,7 +1,9 @@
-## 1.17.8-dev
+## 1.17.8
 
 * Update json reporter docs with updated nullability annotations and
   descriptions.
+* Add `time` field to the json reporters `allSuites` event type so that all
+  event types can be unified.
 
 ## 1.17.7
 
diff --git a/pkgs/test/pubspec.yaml b/pkgs/test/pubspec.yaml
index e897eef..797d251 100644
--- a/pkgs/test/pubspec.yaml
+++ b/pkgs/test/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 1.17.8-dev
+version: 1.17.8
 description: >-
   A full featured library for writing and running Dart tests across platforms.
 repository: https://github.com/dart-lang/test/blob/master/pkgs/test
@@ -34,7 +34,7 @@
   yaml: ^3.0.0
   # Use an exact version until the test_api and test_core package are stable.
   test_api: 0.4.1
-  test_core: 0.3.28-dev
+  test_core: 0.3.28
 
 dev_dependencies:
   fake_async: ^1.0.0
diff --git a/pkgs/test_core/CHANGELOG.md b/pkgs/test_core/CHANGELOG.md
index bbd3496..a7fc460 100644
--- a/pkgs/test_core/CHANGELOG.md
+++ b/pkgs/test_core/CHANGELOG.md
@@ -1,4 +1,7 @@
-## 0.3.28-dev
+## 0.3.28
+
+* Add `time` field to the json reporters `allSuites` event type so that all
+  event types can be unified.
 
 ## 0.3.27
 
diff --git a/pkgs/test_core/pubspec.yaml b/pkgs/test_core/pubspec.yaml
index 51a05cf..55c356f 100644
--- a/pkgs/test_core/pubspec.yaml
+++ b/pkgs/test_core/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test_core
-version: 0.3.28-dev
+version: 0.3.28
 description: A basic library for writing tests and running them on the VM.
 homepage: https://github.com/dart-lang/test/blob/master/pkgs/test_core