rdkafka 0.25.0

# Valgrind suppression file.

# Spurious statx complaints: https://github.com/rust-lang/rust/issues/68979.
# TODO(benesch): remove when CI upgrades to Valgrind 3.16.
{
   <statx1>
   Memcheck:Param
   statx(file_name)
   fun:syscall
   fun:statx
   fun:_ZN3std3sys4unix2fs9try_statx*
   ...
}
{
   <statx2>
   Memcheck:Param
   statx(buf)
   fun:syscall
   fun:statx
   fun:_ZN3std3sys4unix2fs9try_statx*
   ...
}