the `utils::UUID` class is not used by the implementation of
`canonical_mutation`, so let's remove the include from this source file.
the `#include` was originally added in
5a353486c6, but that commit did
add any code using UUID to this file.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closesscylladb/scylladb#15731