bump to 2.9.0 for release to Kilted

Signed-off-by: Steve Macenski <stevenmacenski@gmail.com>

Author: SteveMacenski

package.xml

@@ -2,7 +2,7 @@
 <?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
 <package format="3">
   <name>slam_toolbox</name>
-  <version>2.8.0</version>
+  <version>2.9.0</version>
   <description>
      This package provides a sped up improved slam karto with updated SDK and visualization and modification toolsets
   </description>