Finalizing changelog for version 1.12.0

Author: larrybradley

CHANGES.rst

@@ -1,4 +1,4 @@
-1.12.0 (unreleased)
+1.12.0 (2024-04-12)
 -------------------
 
 General
@@ -20,10 +20,6 @@ General
 
 - NumPy 2.0 is supported.
 
-
-New Features
-^^^^^^^^^^^^
-
 Bug Fixes
 ^^^^^^^^^
 
@@ -44,9 +40,6 @@ API Changes
 1.11.0 (2024-02-16)
 -------------------
 
-General
-^^^^^^^
-
 New Features
 ^^^^^^^^^^^^