flake: `TestUserOIDC/RoleSync/NewUserAndRemoveRolesOnReAuth`

https://github.com/coder/coder/actions/runs/9791002172/job/27033833510?pr=13537

```go
...
    t.go:108: 2024-07-04 08:31:18.415 [erro]  http call not found  path=/derp
         *** slogtest: log detected at level ERROR; TEST FAILURE ***
    idp.go:1165: unexpected request to IDP at path "/derp". Not supported
...
```