Update kubectl to v1.31 (#27)

Signed-off-by: 1gtm <1gtm@appscode.com>

Author: 1gtm

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
           sudo mv yqq /usr/local/bin/yqq
           pipx install yq
           # install kubectl
-          curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.21.1/bin/linux/amd64/kubectl
+          curl -LO https://dl.k8s.io/release/v1.32.1/bin/linux/amd64/kubectl
           chmod +x ./kubectl
           sudo mv ./kubectl /usr/local/bin/kubectl