docs(changelog): changelog for lts-v2.12.3 release

Change-Id: I6b59608f7cedca26927e20dbd0fdf68bf301f5e2
Signed-off-by: Release CI <ci@trustedfirmware.org>
diff --git a/readme.rst b/readme.rst
index 6432246..206c9c7 100644
--- a/readme.rst
+++ b/readme.rst
@@ -51,3 +51,4 @@
 
 
 
+