How to update `psql` version?

Hello,

I just deployed a new Azure Database for PostgreSQL resource. When configuring the deployment, I selected the latest `PostgreSQL version` (v16). However, when I log into the database with Azure Cloud Shell, I'm shown:

```
psql (14.8, server 16.0)
WARNING: psql major version 14, server major version 16.
Some psql features might not work.
```

I skimmed through the docs, but only find references to ["Major Version Upgrades"](https://learn.microsoft.com/en-us/azure/postgresql/flexible-server/how-to-perform-major-version-upgrade-portal).

How do I line up the `psql` version and the `server` version?