remove blank line

Author: paulb777

FirebaseAuth/CHANGELOG.md

@@ -2,7 +2,6 @@
 - [fixed] Updated most decoders to be consistent with Firebase 10's behavior
   for decoding `nil` values. (#14212)
 
-
 # 11.6.0
 - [added] Added reCAPTCHA Enterprise support for app verification during phone
   authentication for Firebase Authentication (#14114)