fixed knn version at the cmake

cmake/GetColumnar.cmake

@@ -20,7 +20,7 @@ include ( update_bundle )
 # Versions of API headers we are need to build with.
 set ( NEED_COLUMNAR_API 25 )
 set ( NEED_SECONDARY_API 14 )
-set ( NEED_KNN_API 2 )
+set ( NEED_KNN_API 3 )
 
 # Note: we don't build, neither link with columnar. Only thing we expect to get is a few interface headers, aka 'columnar_api'.
 # Actual usage of columnar is solely defined by availability of the module named below. That module is build (or not built)