GUACAMOLE-1859: Update to Apache Directory API v2.1.5.

doc/licenses/directory-api-2.1.5/NOTICE

@@ -0,0 +1,5 @@
+Apache Directory LDAP API
+Copyright 2003-2023 The Apache Software Foundation
+
+This product includes software developed at
+The Apache Software Foundation (https://www.apache.org/).

doc/licenses/directory-api-2.1.5/README

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+Apache Directory LDAP API (http://directory.apache.org)
+-------------------------------------------------------
+
+    Version: 2.1.5
+    From: 'Apache Software Foundation' (https://www.apache.org/)
+    License(s):
+        Apache v2.0
+

doc/licenses/directory-api-2.1.5/dep-coordinates.txt

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+org.apache.directory.api:api-all:jar:2.1.5