doc: standardise copyright in cabal file

Author: wenkokke

lsm-tree.cabal

@@ -9,7 +9,10 @@ author:
   Duncan Coutts, Joris Dral, Matthias Heinzel, Wolfgang Jeltsch, Wen Kokke, and Alex Washburn
 
 maintainer:         TODO: MAINTAINER EMAIL
-copyright:          2023 Input Output Global Inc (IOG), INTERSECT 2023-2024
+copyright:
+  (c) 2023 Input Output Global, Inc. (IOG)
+  (c) 2023-2025 INTERSECT
+
 category:           Database
 build-type:         Simple
 extra-doc-files:    CHANGELOG.md