mute test on bugged versions (#127730)

Skips SystemIndicesUpgradeIT when running against 8.0.x due to a bug in that existing released version.

x-pack/qa/rolling-upgrade/src/test/java/org/elasticsearch/upgrades/SystemIndicesUpgradeIT.java

@@ -23,6 +23,7 @@ import org.elasticsearch.logging.Logger;
 import org.elasticsearch.tasks.Task;
 import org.elasticsearch.xcontent.json.JsonXContent;
 import org.elasticsearch.xpack.test.SecuritySettingsSourceField;
+import org.junit.BeforeClass;
 
 import java.io.IOException;
 import java.util.List;
@@ -40,6 +41,11 @@ public class SystemIndicesUpgradeIT extends AbstractUpgradeTestCase {
         new SecureString(SecuritySettingsSourceField.TEST_PASSWORD)
     );
 
+    @BeforeClass
+    public static void avoidBugIn8_0_1() {
+        assumeTrue("https://github.com/elastic/elasticsearch/issues/125168", isOriginalClusterVersionAtLeast(Version.V_8_1_0));
+    }
+
     @Override
     protected Settings restAdminSettings() {
         // Note that we are both superuser here and provide a product origin