[sylva-1.4] update k8s patch version to 1.31.13

as rke2 1.31.12 is released https://github.com/rancher/rke2/releases/tag/v1.31.11%2Brke2r1 , it has to be patched in sylva-1.4.

sylva-core main will be supporting 1.30.11 in MR - !4942 (merged)