Add CHANGELOG entry

Author: angelapwen

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## [UNRELEASED]
 
 - Update default CodeQL bundle version to 2.12.5. [#1585](https://github.com/github/codeql-action/pull/1585)
+- Add "always", "failure-only", and "never" as recognized values for the `upload` input for the `analyze` Action. The prior values of "true" and "false" will continue to be supported, and map to "always" and "never", respectively.
 
 ## 2.2.7 - 15 Mar 2023