Devel::StackTrace 1.28/1.29 doesn't work with RT

because it has a serious bug, from 1.30 Changelog:

- There was an eval which did not first localize $@ and $SIG{__DIE__}. This
  broke Plack::Middleware::StackTrace (and possibly other tihngs)..

see also #21648
Merge branch '4.0/avoid-devel-strack-trace-1.29' into 4.0-trunk