GCP ValueError: Service account info was not in the expected format, missing fields token_uri

Trying to create a GCPCluster after specifying my GCP projectid in `~/.config/dask/cloudprovider.yaml` I get below error related to `ValueError: Service account info was not in the expected format, missing fields token_uri.`

```
from dask_cloudprovider.gcp import GCPCluster
from dask.distributed import wait

cluster = GCPCluster(
zone="us-central1-a",
machine_type="n1-standard-8",
n_workers=1,
docker_image="rapidsai/rapidsai:cuda11.0-runtime-ubuntu18.04-py3.8",
worker_class="dask_cuda.CUDAWorker",
env_vars={"EXTRA_PIP_PACKAGES": "gcsfs"}
)
```

```
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
~/anaconda3/envs/daskcp/lib/python3.7/site-packages/google/auth/_default.py in load_credentials_from_file(filename, scopes, quota_project_id)
134 credentials = service_account.Credentials.from_service_account_info(
--> 135 info, scopes=scopes
136 )

~/anaconda3/envs/daskcp/lib/python3.7/site-packages/google/oauth2/service_account.py in from_service_account_info(cls, info, **kwargs)
210 signer = _service_account_info.from_dict(
--> 211 info, require=["client_email", "token_uri"]
212 )

~/anaconda3/envs/daskcp/lib/python3.7/site-packages/google/auth/_service_account_info.py in from_dict(data, require)
50 "Service account info was not in the expected format, missing "
---> 51 "fields {}.".format(", ".join(missing))
52 )

ValueError: Service account info was not in the expected format, missing fields token_uri.

The above exception was the direct cause of the following exception:

DefaultCredentialsError Traceback (most recent call last)
in
17 docker_image="rapidsai/rapidsai:cuda11.0-runtime-ubuntu18.04-py3.8",
18 worker_class="dask_cuda.CUDAWorker",
---> 19 env_vars={"EXTRA_PIP_PACKAGES": "gcsfs"}
20 )

~/anaconda3/envs/daskcp/lib/python3.7/site-packages/dask_cloudprovider/gcp/instances.py in __init__(self, projectid, zone, machine_type, source_image, docker_image, ngpus, gpu_type, filesystem_size, auto_shutdown, bootstrap, **kwargs)
512 ):
513
--> 514 self.compute = GCPCompute()
515
516 self.config = dask.config.get("cloudprovider.gcp", {})

~/anaconda3/envs/daskcp/lib/python3.7/site-packages/dask_cloudprovider/gcp/instances.py in __init__(self)
551
552 def __init__(self):
--> 553 self._compute = self.refresh_client()
554
555 def refresh_client(self):

~/anaconda3/envs/daskcp/lib/python3.7/site-packages/dask_cloudprovider/gcp/instances.py in refresh_client(self)
570 # take first row
571 f_.write(creds_rows[0][1])
--> 572 creds, _ = google.auth.load_credentials_from_file(filename=f)
573 return googleapiclient.discovery.build("compute", "v1", credentials=creds)
574

~/anaconda3/envs/daskcp/lib/python3.7/site-packages/google/auth/_default.py in load_credentials_from_file(filename, scopes, quota_project_id)
138 msg = "Failed to load service account credentials from {}".format(filename)
139 new_exc = exceptions.DefaultCredentialsError(msg, caught_exc)
--> 140 six.raise_from(new_exc, caught_exc)
141 if quota_project_id:
142 credentials = credentials.with_quota_project(quota_project_id)

~/.local/lib/python3.7/site-packages/six.py in raise_from(value, from_value)

DefaultCredentialsError: ('Failed to load service account credentials from /tmp/tmp79wsxl8a.', ValueError('Service account info was not in the expected format, missing fields token_uri.'))
```

**Anything else we need to know?**:

**Environment**:

- Dask version: 2.30.0
- Python version: 3.7.9
- Operating System: Ubuntu 18.04.4 LTS
- Install method (conda, pip, source): conda