Merge pull request #4892 from fluxcd/conformance-tests-k8s-1.31

Run conformance tests for Kubernetes v1.31

Author: stefanprodan

.github/workflows/conformance.yaml

@@ -19,7 +19,7 @@ jobs:
       matrix:
         # Keep this list up-to-date with https://endoflife.date/kubernetes
         # Build images with https://github.com/fluxcd/flux-benchmark/actions/workflows/build-kind.yaml
-        KUBERNETES_VERSION: [ 1.28.11, 1.29.6, 1.30.2 ]
+        KUBERNETES_VERSION: [ 1.28.11, 1.29.6, 1.30.2, 1.31.0 ]
       fail-fast: false
     steps:
       - name: Checkout