ci: update gke version
* ci: update gke version
1.18.* is no longer available.  Rather than doing the minimum possible
update, switch to rhat gke says is the default version of the "Regular
Channel".
* ci: bump to 1.21 instead of 1.20
@@ -1567,7 +1567,7 @@ jobs:
default: 1
gke-version:
type: string
- default: "1.18.20-gke.4100"
+ default: "1.21.3-gke.2001"
machine-type:
type: string
default: "n1-standard-8"
@@ -1650,7 +1650,7 @@ jobs:
default: 1
gke-version:
type: string
- default: "1.18.20-gke.4100"
+ default: "1.21.3-gke.2001"
machine-type:
type: string
default: "n1-standard-8"
