I can't connect to a private repo anymore

I reopened a project where I was using a private repo with HTTPS authentication and an AuthGroup, it worked fine but it seems we can't use this type of authentication with Github anymore (if I'm not mistaken).

I didn't find how to use an access token (I tried replace the password by the token), so I tried with SSH but got the following error:

```
Failed to notify build listener.
> Invalid remote: origin
````

I try if my SSH connexion is valid with `ssh -T git@github.com` and it works fine : `Hi fabriceci! You've successfully authenticated, but GitHub does not provide shell access.`

Here if my config:
```
git {
implementation 'git@github.com:fabriceci/xxx.git', {
authGroup 'ssh'
keepUpdated false
}
}
```

I was not sure, but I put my SSH password in my gradle properties file (As I used to do before the classic user/pass connection) :

```
git.ssh.password=xxx
```

Have you an idea how to solve this?