Old tokens can still be used after logging out.

[PhamChiNang151020]

Hi, I have a problem as follows

Currently I am using: aad_oauth: ^0.4.3

1. I did: await oauth.login() -> Token got

e.x token1 = "abc123".

2. After successful login. I use

await oauth.logout();

3. I log in again similar to step 1.

e.x token2 = "asd567"

After logging in in step 3, I tried using token1 to call oidc/userinfo (roughly get user information)

Then the old token still works (token1)