[compatible] OPAM: update dune to 3.16.0

[dannywillems]

Following commands:

opam install dune.3.16.0 -y
opam switch export opam.export

Version of OPAM used: 2.2.1

OCaml is now moving fast, and dependencies are upgrading quickly. We might want to update the dependencies gradually. Starting with dune.

Explain your changes: *

Explain how you tested your changes: *

Checklist:

• [ ] Dependency versions are unchanged
  • Notify Velocity team if dependencies must change in CI
• [ ] Modified the current draft of release notes with details on what is completed or incomplete within this project
• [ ] Document code purpose, how to use it
  • Mention expected invariants, implicit constraints
• [ ] Tests were added for the new behavior
  • Document test purpose, significance of failures
  • Test names should reflect their purpose
• [ ] All tests pass (CI will check this if you didn't)
• [ ] Serialized types are in stable-versioned modules
• [ ] Does this close issues? List them

• Closes #0000

[dannywillems]

!ci-bulid-me

[dannywillems]

!ci-bulid-me

[dannywillems]

Closing for now. I would certainly open a new one in the future when I'll be back on Mina.

[L-as]

This would be nice to have.