* Update the webauthn_credential_id_sequence in Postgres
There is (yet) another problem with v210 in that Postgres will silently allow preset
ID insertions ... but it will not update the sequence value.
This PR simply adds a little step to the end of the v210 migration to update the
sequence number.
Users who have already migrated who find that they cannot insert new
webauthn_credentials into the DB can either run:
```bash
gitea doctor recreate-table webauthn_credential
```
or
```bash
./gitea doctor --run=check-db-consistency --fix
```
which will fix the bad sequence.
Fix#19012
Signed-off-by: Andrew Thornton <art27@cantab.net>
