Change model to Claude v2

Author: DennisTraub

example_code/src/main/java/aws/community/examples/InvokeBedrock.java

@@ -29,7 +29,7 @@ public static void main(String[] args) {
         );
 
         InvokeModelRequest request = InvokeModelRequest.builder()
-                .modelId("anthropic.claude-v1")
+                .modelId("anthropic.claude-v2")
                 .body(body)
                 .build();
 
@@ -45,4 +45,4 @@ public static void main(String[] args) {
         System.out.println(completion);
         System.out.println();
     }
-}
+}