Fix memtrace_viewer with dune 3.0.0 (#20815)
* Fix memtrace_viewer with dune 3.0.0
Dune 3.0.0 removed the --cache-transport argument and made direct the default:
https://github.com/ocaml/dune/pull/4493.
* memtrace_viewer.0.14.0 missing bound on js_of_ocaml
* memtrace_viewer.0.14.x: Apply suggestions from code review
* memtrace_viewer.0.14.x: add conflicts on re (due to vendoring)
Co-authored-by: Marcello Seri <mseri@users.noreply.github.com>
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