Fix copyright years to 2023-2024

Author: bobleesj

doc/source/conf.py

@@ -62,7 +62,7 @@
 
 # General information about the project.
 project = "diffpy.snmf"
-copyright = "2009-%Y, The Trustees of Columbia University in the City of New York"
+copyright = "2023-%Y, The Trustees of Columbia University in the City of New York"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the

doc/source/license.rst

@@ -9,7 +9,7 @@ OPEN SOURCE LICENSE AGREEMENT
 =============================
 BSD 3-Clause License
 
-Copyright (c) 2009-2024, The Trustees of Columbia University in 
+Copyright (c) 2023-2024, The Trustees of Columbia University in 
 the City of New York.
 All Rights Reserved.