Update XML version

Author: EwanC

xml/cl.xml

@@ -7191,7 +7191,7 @@ server's OpenCL/api-docs repository.
                 <command name="clSetContentSizeBufferPoCL"/>
             </require>
         </extension>
-        <extension name="cl_khr_command_buffer" revision="0.9.6" supported="opencl" depends="CL_VERSION_1_2" ratified="opencl" provisional="true">
+        <extension name="cl_khr_command_buffer" revision="0.9.7" supported="opencl" depends="CL_VERSION_1_2" ratified="opencl" provisional="true">
             <require>
                 <type name="CL/cl.h"/>
             </require>