[hotfix] Update copyright year to 2024

This closes #25.

Author: ruanhang1993

NOTICE

@@ -1,5 +1,5 @@
 Apache Flink Cassandra Connector
-Copyright 2014-2023 The Apache Software Foundation
+Copyright 2014-2024 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connector-cassandra/src/main/resources/META-INF/NOTICE

@@ -1,5 +1,5 @@
 flink-connector-cassandra
-Copyright 2014-2023 The Apache Software Foundation
+Copyright 2014-2024 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).