Documentation says the mysql driver is not needed

### Description

That's what this documentation claims [docs/jdbc.md](https://github.com/GoogleCloudPlatform/cloud-sql-jdbc-socket-factory/blob/main/docs/jdbc.md).

Which may be correct if you know how to get the actual dependency loaded (e.g. there's a `native` maven profile which might achieve it), however, I couldn't get it to work without actually adding the mysql driver as a dependency in my project, via:

```

com.mysql
mysql-connector-j
9.4.0
compile

com.google.cloud.sql
mysql-socket-factory-connector-j-8
1.25.3

```

Only then could I create and use a fat (uber) jar that worked. Also, the mysql setup instructions differ in that respect from all other DB vendor instructions.

### Potential Solution

Just state that also mysql will need the driver and recommend a version.

### Additional Details

_No response_