Update CHANGELOG.md

Author: spencertransier

CHANGELOG.md

@@ -21,6 +21,7 @@ _None_
 - Add "Mobile Secrets" to `configure_update` current branch message to clarify which repo it's referring to. [#455]
 - `buildkite_trigger_build` now prints the web URL of the newly scheduled build, to allow you to easily open it via cmd-click. [#460]
 - Add the branch information to the 'This is not a release branch' error that's thrown from complete code freeze lane. [#461]
+- Update `octokit` to `5.6.1` and `danger` to `9.3.0`. These are both major version changes, but as the dependency is internal-only, it shouldn't be a breaking change for clients. [#464]
 
 ## 7.0.0