readme: bump tested version and pre-release changelog

readme.txt

@@ -2,7 +2,7 @@
 Contributors: michaelryanmcneill, willnorris, mitchoyoshitaka, jrchamp, dericcrago, bshelton229, Alhrath, dandalpiaz
 Tags: shibboleth, authentication, login, saml
 Requires at least: 4.0
-Tested up to: 6.2
+Tested up to: 6.3
 Requires PHP: 5.6
 Stable tag: 2.4.2
 
@@ -197,6 +197,9 @@ This update brings with it a major change to the way Shibboleth attributes are a
 This update brings with it a major change to the way Shibboleth attributes are accessed. For most users, no additional configuration will be necessary. If you are using a specialized server configuration, such as a Shibboleth Service Provider on a reverse proxy or a server configuration that results in environment variables being sent with the prefix REDIRECT_, you should see the changelog for additional details: https://wordpress.org/plugins/shibboleth/#developers
 
 == Changelog ==
+= version 2.4.3 (not yet released) =
+ - CI: Update GitHub Action workflows and code for WordPress coding standard v3 [#94](https://github.com/michaelryanmcneill/shibboleth/pull/94)
+
 = version 2.4.2 (2023-04-07) =
  - Documentation: Updated Shibboleth documentation external links [#92](https://github.com/michaelryanmcneill/shibboleth/pull/92)
  - Accessibility: Improve labels and heading structure on admin pages [#92](https://github.com/michaelryanmcneill/shibboleth/pull/92)