Upgrade to irmin.3.4.3: fix open flags for RO instances (see https://github.com/ocaml/opam-repository/pull/22321 for details)
Update multiple dependencies as well

Checklist

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
Select suitable reviewers using the Reviewers field below.
Select as Assignee the next person who should take action on that MR

Edited Oct 26, 2022 by Victor Allombert

Upgrade to irmin.3.4.3