Fixed checkstyle issue

Author: chiaramapellimt

service/src/test/java/uk/nhs/adaptors/gp2gp/ehr/mapper/EhrExtractMapperTest.java

@@ -4,7 +4,9 @@
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.mockito.Mockito.*;
+import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.lenient;
 
 import java.time.Instant;
 import java.time.temporal.ChronoUnit;