Fixed RepeatStaticTests

Author: ivancea

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/scalar/string/RepeatStaticTests.java

@@ -56,8 +56,8 @@ public void testTooBig() {
         String repeated = process(str, number);
         assertNull(repeated);
         assertWarnings(
-            "Line 1:1: java.lang.IllegalArgumentException: Creating repeated strings with more than [1048576] bytes is not supported",
-            "Line 1:1: evaluation of [source] failed, treating result as null. Only first 20 failures recorded."
+            "Line -1:-1: java.lang.IllegalArgumentException: Creating repeated strings with more than [1048576] bytes is not supported",
+            "Line -1:-1: evaluation of [] failed, treating result as null. Only first 20 failures recorded."
         );
     }