Update opam metadata and update dune version to 3.0 #5656
Merged
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Adds mising dependencies and uses correct formula for enforcing same version
Added a missing dependency to message-switch-core. For some reason this was OK in ocaml 4.14.1 builds, but not on the 4.14.2 ones.
Update to dune version 3. This generates warnings for unused bindings on binaries, even if they don't have an empty mli defined. This needed some removals or changes to recover the unit tests