Update copyright dates.

build.bat

@@ -1,7 +1,7 @@
 @echo off
 
 rem  Inno Setup
-rem  Copyright (C) 1997-2019 Jordan Russell
+rem  Copyright (C) 1997-2024 Jordan Russell
 rem  Portions by Martijn Laan
 rem  For conditions of distribution and use, see LICENSE.TXT.
 rem

compile.bat

@@ -1,7 +1,7 @@
 @echo off
 
 rem  Inno Setup
-rem  Copyright (C) 1997-2019 Jordan Russell
+rem  Copyright (C) 1997-2024 Jordan Russell
 rem  Portions by Martijn Laan
 rem  For conditions of distribution and use, see LICENSE.TXT.
 rem