MDL-51530 libraries: Upgrade less.php to 1.7.0.9

lib/lessphp/Version.php

@@ -8,8 +8,8 @@
  */
 class Less_Version{
 
-	const version = '1.7.0.3';			// The current build number of less.php
+	const version = '1.7.0.9';			// The current build number of less.php
 	const less_version = '1.7';			// The less.js version that this build should be compatible with
     const cache_version = '170';		// The parser cache version
 
-}
+}