Remove accidental `org.jetbrains:annotations` usage.

See spring-projects/spring-data-build#2670

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/mybatis/MyBatisDataAccessStrategyUnitTests.java

@@ -28,7 +28,6 @@ import java.util.stream.Stream;
 
 import org.apache.ibatis.cursor.Cursor;
 import org.apache.ibatis.session.SqlSession;
-import org.jetbrains.annotations.NotNull;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.mockito.ArgumentCaptor;
@@ -517,7 +516,6 @@ public class MyBatisDataAccessStrategyUnitTests {
 
 			}
 
-			@NotNull
 			@Override
 			public Iterator<String> iterator() {
 				return List.of(value).iterator();

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/repository/DeclaredQueryRepositoryUnitTests.java

@@ -19,7 +19,6 @@ package org.springframework.data.jdbc.repository;
 import static org.assertj.core.api.Assertions.*;
 import static org.mockito.Mockito.*;
 
-import org.jetbrains.annotations.NotNull;
 import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.Test;
 import org.mockito.ArgumentCaptor;
@@ -91,7 +90,7 @@ public class DeclaredQueryRepositoryUnitTests {
 		return queryCaptor.getValue();
 	}
 
-	private @NotNull <T extends CrudRepository> T repository(Class<T> repositoryInterface) {
+	private <T extends CrudRepository> T repository(Class<T> repositoryInterface) {
 
 		Dialect dialect = JdbcHsqlDbDialect.INSTANCE;