remove unused import

Author: vladak

opengrok-indexer/src/test/java/org/opengrok/indexer/history/MercurialRepositoryTest.java

@@ -23,7 +23,6 @@
  */
 package org.opengrok.indexer.history;
 
-import org.apache.commons.lang3.tuple.Pair;
 import org.apache.commons.lang3.tuple.Triple;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeAll;