pkg:js - Update changelog and SDK constraint

Change-Id: I3b518169293f000cc4a1665c54d155dc4b33b070
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/265640
Reviewed-by: Srujan Gaddam <srujzs@google.com>
Auto-Submit: Kevin Moore <kevmoo@google.com>
Commit-Queue: Kevin Moore <kevmoo@google.com>

Author: kevmoo

pkg/js/CHANGELOG.md

@@ -1,10 +1,14 @@
+## 0.6.6-dev
+
+* Add `@JSExport` annotation for exporting Dart classes and `@staticInterop`
+  mocking.
+* Require Dart 2.19
+
 ## 0.6.5
 
 * Populate the pubspec repository field.
 * Add a dependency on `package:meta`.
 * Add an experimental `@trustTypes` annotation.
-* Add `@JSExport` annotation for exporting Dart classes and `@staticInterop`
-  mocking.
 
 ## 0.6.4
 

pkg/js/pubspec.yaml

@@ -1,10 +1,10 @@
 name: js
-version: 0.6.5
+version: 0.6.6-dev
 description: Annotations to create static Dart interfaces for JavaScript APIs.
 repository: https://github.com/dart-lang/sdk/tree/main/pkg/js
 
 environment:
-  sdk: ">=2.16.0-100.0.dev <3.0.0"
+  sdk: ">=2.19.0-333.0.dev <3.0.0"
 
 dependencies:
   meta: ^1.7.0