bump to 4.2.0 in prep for publishing (#795)

Co-authored-by: Moritz <[email protected]>

Author: devoncarew

CHANGELOG.md

@@ -1,14 +1,14 @@
-## 4.2.0-wip
+## 4.2.0
 
-- Require Dart 3.8.
 - Export a protobuf generated symbol (`Any`)
-- Dart format all files for the new 3.8 formatter.
+- Simplify hierarchy of `ResponseFuture` (no longer have a private class in the
+  type hierarchy)
+- Require Dart 3.8.
 - Require package:googleapis_auth
 - Require package:http 1.4.0
 - Require package:lints 6.0.0
 - Require package:protobuf 4.1.0
-- Simplify hierarchy of `ResponseFuture` (no longer have a private class in the
-  type hierarchy)
+- Dart format all files for the new 3.8 formatter.
 
 ## 4.1.0
 

pubspec.yaml

@@ -1,5 +1,5 @@
 name: grpc
-version: 4.2.0-wip
+version: 4.2.0
 description: Dart implementation of gRPC, a high performance, open-source universal RPC framework.
 repository: https://github.com/grpc/grpc-dart