Remove unused import from test file

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Author: Copilot

samples/xapi-server/src/test/java/dev/learning/xapi/samples/xapiserver/StatementsControllerTest.java

@@ -4,7 +4,6 @@
 
 package dev.learning.xapi.samples.xapiserver;
 
-import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.when;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;