Update anders.xml

Author: MaKu237

anders.xml

@@ -15,8 +15,7 @@
                     >https://correspsearch.net/storage/anders.xml</idno>
                 <date when="2023-02-23T13:00:29.962417"/>
                 <availability>
-                    <licence target="https://creativecommons.org/licenses/by/4.0/">This file is
-                        licensed under the terms of the Creative-Commons-License CC-BY 4.0</licence>
+                    <licence target="https://creativecommons.org/publicdomain/zero/1.0/">CC0</licence>
                 </availability>
             </publicationStmt>
             <sourceDesc>