Upgrade Kubernetes to v1.31.0 (#2170)

Author: mauri870

.buildkite/pipeline.serverless.yml

@@ -4,7 +4,7 @@ env:
   DOCKER_COMPOSE_VERSION: "v2.24.1"
   DOCKER_VERSION: "26.1.2"
   KIND_VERSION: 'v0.20.0'
-  K8S_VERSION: 'v1.29.0'
+  K8S_VERSION: 'v1.31.0'
   GH_CLI_VERSION: "2.29.0"
   YQ_VERSION: 'v4.44.3'
 

.buildkite/pipeline.yml

@@ -3,7 +3,7 @@ env:
   DOCKER_COMPOSE_VERSION: "v2.24.1"
   DOCKER_VERSION: "26.1.2"
   KIND_VERSION: 'v0.20.0'
-  K8S_VERSION: 'v1.30.0'
+  K8S_VERSION: 'v1.31.0'
   YQ_VERSION: 'v4.44.3'
 
   # Agent images used in pipeline steps