CI: Update kubectl to v1.31.5. (#12789)

Co-authored-by: Marco Ebert <[email protected]>

Author: k8s-infra-cherrypick-robot

.github/workflows/ci.yaml

@@ -172,7 +172,7 @@ jobs:
 
       - name: Prepare Host
         run: |
-          curl -LO https://dl.k8s.io/release/v1.27.3/bin/linux/amd64/kubectl
+          curl -LO https://dl.k8s.io/release/v1.31.5/bin/linux/amd64/kubectl
           chmod +x ./kubectl
           sudo mv ./kubectl /usr/local/bin/kubectl