Eliminate use of deprecated 'serialize' term as much as possible
We'll need a new binary format version with different key names before we can complete the job, but this fixes all the other uses in this repo.
Bug: T353354
How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
Support: mw:GitLab, how to host a project on GitLab, #wikimedia-gitlab on libera.chat, #GitLab on Phabricator.
We'll need a new binary format version with different key names before we can complete the job, but this fixes all the other uses in this repo.
Bug: T353354