fix link in index.md (#433)

Author: wojsmol

index.md

@@ -31,7 +31,7 @@ Ongoing maintenance is made possible by:
 	</a>
 </div>
 
-The current stable release is [version 2.8.1](https://make.wordpress.org/cli/2023/05/31/wp-cli-v2-8-1-release-notes/). For announcements, follow [@wpcli on Twitter](https://twitter.com/wpcli) or [sign up for email updates](https://make.wordpress.org/cli/subscribe/). [Check out the roadmap](https://make.wordpress.org/cli/handbook/roadmap/) for an overview of what's planned for upcoming releases.
+The current stable release is [version 2.8.1](https://make.wordpress.org/cli/2023/06/05/wp-cli-v2-8-1-release-notes/). For announcements, follow [@wpcli on Twitter](https://twitter.com/wpcli) or [sign up for email updates](https://make.wordpress.org/cli/subscribe/). [Check out the roadmap](https://make.wordpress.org/cli/handbook/roadmap/) for an overview of what's planned for upcoming releases.
 
 [![Testing](https://github.com/wp-cli/automated-tests/actions/workflows/testing.yml/badge.svg)](https://github.com/wp-cli/automated-tests/actions/workflows/testing.yml) [![Average time to resolve an issue](https://isitmaintained.com/badge/resolution/wp-cli/wp-cli.svg)](https://isitmaintained.com/project/wp-cli/wp-cli "Average time to resolve an issue") [![Percentage of issues still open](https://isitmaintained.com/badge/open/wp-cli/wp-cli.svg)](https://isitmaintained.com/project/wp-cli/wp-cli "Percentage of issues still open")