[ package:vm_service ] Prepare for 7.4.0 release

TEST=N/A

Change-Id: I1d1bec314fdca9b673f432400bb0d1144d8d7927
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/218881
Reviewed-by: Siva Annamalai <asiva@google.com>
diff --git a/pkg/vm_service/CHANGELOG.md b/pkg/vm_service/CHANGELOG.md
index 6b3803c..50d973c 100644
--- a/pkg/vm_service/CHANGELOG.md
+++ b/pkg/vm_service/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 7.4.0
+- Update to version `3.52` of the spec.
+- Added `lookupResolvedPackageUris` and `lookupPackageUris` RPCs and `UriList`
+  type.
+
 ## 7.3.0
 - Update to version `3.51` of the spec.
 - Added optional `reportLines` parameter to `getSourceReport` RPC.
diff --git a/pkg/vm_service/pubspec.yaml b/pkg/vm_service/pubspec.yaml
index 85b7cad..81e92a4 100644
--- a/pkg/vm_service/pubspec.yaml
+++ b/pkg/vm_service/pubspec.yaml
@@ -3,7 +3,7 @@
   A library to communicate with a service implementing the Dart VM
   service protocol.
 
-version: 7.3.0
+version: 7.4.0
 
 homepage: https://github.com/dart-lang/sdk/tree/master/pkg/vm_service