Getting incorrect user email (I get old email instead current)

### [REQUIRED] Step 2: Describe your environment

* Operating System version: GAE
* Firebase SDK version: v.3.13.0+incompatible
* Library version: _____
* Firebase Product: auth

### [REQUIRED] Step 3: Describe the problem

#### Steps to reproduce:

When getting user by ID, I get a UserRecord with a very-very-old Email. I cant find that email configured in any place at google workspache user profile anymore.

#### Relevant Code:

This is the function I'm using.

```
https://pkg.go.dev/firebase.google.com/go/auth#Client.GetUser
```