Update changelog for v2.20.3

2023-07-06 13:14:11 +00:00 · 2023-07-06 13:14:11 +00:00 · d0206e8c49
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -1,6 +1,6 @@
 # CodeQL Action Changelog

-## [UNRELEASED]
+## 2.20.3 - 06 Jul 2023

 - Update default CodeQL bundle version to 2.13.5. [#1743](https://github.com/github/codeql-action/pull/1743)