Revert "Revert "-> 2.1.6 ldap api""

This reverts commit a0063005095ef45a8406f95e2eae0fadc556923e.
diff --git a/pom.xml b/pom.xml
index ef01eb7..d8d131a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -59,7 +59,7 @@
   <properties>
     <java.version>11</java.version>
     <additionalparam>-Xdoclint:none</additionalparam>
-    <version.ldap.api>2.1.4</version.ldap.api>
+    <version.ldap.api>2.1.6</version.ldap.api>
     <version.apacheds>2.0.0.AM26</version.apacheds>
     <version.accelerator.api>1.0-RC41</version.accelerator.api>
     <version.accelerator.impl>1.0-RC41</version.accelerator.impl>