Add missing import.

Author: afoucret

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/CsvTests.java

@@ -126,7 +126,7 @@
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.everyItem;
 import static org.hamcrest.Matchers.greaterThan;
-import static org.hamcrest.Matchers.hasSize;
+import static org.hamcrest.Matchers.in;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.notNullValue;