fix: allocation of local ssds in k8s tests (#1870)

### Description

Fixes a bug in tests introduced in #1858 

### QC

* [x] The PR contains a test case for the changes or the changes are
already covered by an existing test case.
* [x] The documentation (`docs/`) is updated to reflect the changes or
this is not necessary (e.g. if the change does neither modify the
language nor the behavior or functionalities of Snakemake).

tests/test_kubernetes.py

@@ -17,7 +17,7 @@ def __init__(self):
             try:
                 shell(
                     """
-                    gcloud container clusters create {self.cluster} --num-nodes 3 --scopes storage-rw --zone us-central1-a --machine-type n1-standard-2 --ephemeral-storage local-ssd-count=1
+                    gcloud container clusters create {self.cluster} --num-nodes 3 --scopes storage-rw --zone us-central1-a --machine-type n1-standard-2 --local-ssd-count=1
                     gcloud container clusters get-credentials {self.cluster} --zone us-central1-a
                     gsutil mb gs://{self.bucket_name}
                     """