CI: increase lifetime of [documentation:odoc] artifacts

What

Increase expiry of documentation:odoc artifacts from 1 hour to 4 hours.

Why

• documentation:build_all needs the artifacts of documentation:odoc
• but documentation:build_all may start after the expiry of those artifacts if the build job it needs succeeds at the 3rd retry (e.g https://gitlab.com/tezos/tezos/-/jobs/10760778953).

How

• simple change + make -C ci

Manually testing the MR

• make -C ci check passes

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