[clad] Bump clad to version v1.9

Author: vgvassilev

interpreter/cling/tools/plugins/clad/CMakeLists.txt

@@ -74,7 +74,7 @@ if (DEFINED CLAD_SOURCE_DIR)
   list(APPEND _clad_extra_settings SOURCE_DIR ${CLAD_SOURCE_DIR})
 else()
   list(APPEND _clad_extra_settings GIT_REPOSITORY https://github.com/vgvassilev/clad.git)
-  list(APPEND _clad_extra_settings GIT_TAG v1.7)
+  list(APPEND _clad_extra_settings GIT_TAG v1.9)
 endif()
 
 #list(APPEND _clad_patches_list "patch1.patch" "patch2.patch")