Auth error:Error: Could not refresh access token

### [REQUIRED] Codelab info

Following the [Cloud Functions for Firebase](https://firebase.google.com/codelabs/firebase-cloud-functions#8) codelab (step 9)

### [REQUIRED] Project setup

Using the given starter repository [/cloud-functions-start/](https://github.com/firebase/codelab-friendlychat-web/tree/main/cloud-functions-start)

### [REQUIRED] Describe the problem

After just following the instructions and deploy the "blurOffensiveImages" function, when I upload an image that should be blurred, nothing happens (it stays as it is).

*(Note that I've checked on the Vision [homepage](https://cloud.google.com/vision/) if my image will be recognized as offensive, so the problem should not come from a bad detection)*

I've checked the function logs and there is the same error multiple times :
`Auth error:Error: Could not refresh access token. `


It will then ends with `Function execution took 60006 ms, finished with status: 'timeout'`

It seems that there was an error with the `google-gax` package or something, but every solutions I've looked for said that it should be resolved now. I've tried to re-deploy multiple times, without any difference.

Code is the exact same as shown in the codelab (I made copy/paste)

We are several people to have that same problem on this codelab.

Any thoughts? Thanks :)

### [Optional] Suggested fix

N/A