Prepare v0.64.1 release

Signed-off-by: Ashutosh Narkar <[email protected]>

Author: ashutosh-narkar

CHANGELOG.md

@@ -3,6 +3,13 @@
 All notable changes to this project will be documented in this file. This
 project adheres to [Semantic Versioning](http://semver.org/).
 
+## 0.64.1
+
+This is a bug fix release addressing the following issues:
+
+- ci: Pin GitHub Actions macos runner version. The architecture of the GitHub Actions Runner `macos-latest` was changed from `amd64` to `arm64` and as a result `darwin/amd64` binary wasn't released ([#6720](https://github.com/open-policy-agent/opa/issues/6720)) authored by @suzuki-shunsuke
+- plugins/discovery: Update comparison logic used in the discovery plugin for handling overrides. This fixes a panic that resulted from the comparison of uncomparable types ([#6723](https://github.com/open-policy-agent/opa/pull/6723)) authored by @ashutosh-narkar
+
 ## 0.64.0
 
 > **_NOTES:_**