Add change note

Author: aeisenberg

CHANGELOG.md

@@ -7,6 +7,7 @@ See the [releases page](https://github.com/github/codeql-action/releases) for th
 - Update default CodeQL bundle version to 2.14.3. [#1845](https://github.com/github/codeql-action/pull/1845)
 - Fixed a bug in CodeQL Action 2.21.3 onwards that affected beta support for [Project Lombok](https://projectlombok.org/) when analyzing Java. The environment variable `CODEQL_EXTRACTOR_JAVA_RUN_ANNOTATION_PROCESSORS` will now be respected if it was manually configured in the workflow. [#1844](https://github.com/github/codeql-action/pull/1844)
 - Enable support for Kotlin 1.9.20 when running with CodeQL CLI v2.13.4 through v2.14.3. [#1853](https://github.com/github/codeql-action/pull/1853)
+- Better error message when there is a failure to determine the merge base of the code to analysis. [#1860](https://github.com/github/codeql-action/pull/1860)
 
 ## 2.21.4 - 14 Aug 2023