Add changelog note

Author: henrymercer

CHANGELOG.md

@@ -9,6 +9,7 @@ No user facing changes.
 - Add `sarif-id` as an output for the `upload-sarif` and `analyze` actions. [#889](https://github.com/github/codeql-action/pull/889)
 - Add `ref` and `sha` inputs to the `analyze` action, which override the defaults provided by the GitHub Action context. [#889](https://github.com/github/codeql-action/pull/889)
 - Update default CodeQL bundle version to 2.8.0. [#911](https://github.com/github/codeql-action/pull/911)
+- The CodeQL Action now uses Node.js v16.
 
 ## 1.0.31 - 31 Jan 2022