Prepare v0.42.1 release

Signed-off-by: Ashutosh Narkar <anarkar4387@gmail.com>

CHANGELOG.md

@@ -3,6 +3,15 @@
 All notable changes to this project will be documented in this file. This
 project adheres to [Semantic Versioning](http://semver.org/).
 
+
+## 0.42.1
+
+This is a bug fix release that addresses the following:
+
+1. An issue while writing data to the in-memory store at a non-root nonexistent path ([#4855](https://github.com/open-policy-agent/opa/issues/4855)), reported by @wermerb and others.
+2. Policies owned by a bundle could be replaced via the REST API because of a missing bundle scope check ([#4846](https://github.com/open-policy-agent/opa/issues/4846)).
+3. Adds missing `future.keywords` import for the examples in the policy testing section of the docs ([#4849](https://github.com/open-policy-agent/opa/issues/4849)), reported by @robert-elles.
+
 ## 0.42.0
 
 This release contains a number of fixes and enhancements.