Update copyright since value for Product Data

DEVSIX-5606

Autoported commit.
Original commit hash: [037d9efc1]

Author: Kate Ivanova

itext/itext.kernel/itext/kernel/actions/data/ITextCoreProductData.cs

@@ -35,7 +35,7 @@ public class ITextCoreProductData {
 
         private const String CORE_VERSION = "7.2.0-SNAPSHOT";
 
-        private const int CORE_COPYRIGHT_SINCE = 1998;
+        private const int CORE_COPYRIGHT_SINCE = 2000;
 
         private const int CORE_COPYRIGHT_TO = 2021;