[test] mad tests more lenient approximation

Author: andyb-elastic

server/src/test/java/org/elasticsearch/search/aggregations/metrics/MedianAbsoluteDeviationAggregatorTests.java

@@ -202,7 +202,7 @@ public static IsCloseToRelative closeToRelative(double expected, double error) {
         }
 
         public static IsCloseToRelative closeToRelative(double expected) {
-            return closeToRelative(expected, 0.05);
+            return closeToRelative(expected, 0.1);
         }
     }