Update CHANGELOG.md

Author: Xiaoshouzi-gh

FirebaseAuth/CHANGELOG.md

@@ -1,4 +1,6 @@
 # Unreleased
+- [added] Added reCAPTCHA enterprise support before sending SMS. This includes
+  Phone Authentication flows and SMS MFA flows. (#14114)
 - [fixed] Restore Firebase 10 behavior by synchronizing access to the
   `Auth.currentUser` API. This resolves some Firebase 11 issues where the
   current user is unexpectedly `nil` at startup.