Prepare for v4.2.0 release

CHANGELOG.md

@@ -1,12 +1,13 @@
 ## Unreleased
 
+## 4.2.0 (September 14, 2023)
 - Reintroduce switching builds to pyproject.toml; when publishing the package to PyPI both
   source-based and wheel distributions are now published. For most users the installs will now favor
   the wheel distribution, but users invoking pip with `--no-binary :all:` will continue having
   installs based on the source distribution.
 - Return mapping information for terraform conversions (https://github.com/pulumi/pulumi-kubernetes/pull/2457)
 - feature: added skipUpdateUnreachable flag to proceed with the updates without failing (https://github.com/pulumi/pulumi-kubernetes/pull/2528)
-- 
+
 ## 4.1.1 (August 23, 2023)
 
 - Revert the switch to pyproject.toml and wheel-based PyPI publishing as it impacts users that run pip with --no-binary