Updating tools/fastreer from version 2.1.3 to 2.1.6 (#7926)

Co-authored-by: planemo-autoupdate <planemo-autoupdate@users.noreply.github.com>

Author: gxydevbot

tools/fastreer/macros.xml

@@ -9,7 +9,7 @@
             fastreeR --version
         ]]></version_command>
     </xml>
-    <token name="@TOOL_VERSION@">2.1.3</token>
+    <token name="@TOOL_VERSION@">2.1.6</token>
     <token name="@VERSION_SUFFIX@">0</token>
     <token name="@PROFILE@">24.0</token>
     <xml name="xrefs">