node: cpumgr: move to stable in 1.26
node: cpumgr: move to stable in 1.26

Add the missing metadata to promote to stable in 1.26

Signed-off-by: Francesco Romani <c7100b580e6017ef67482ace46578cdd2d2e0dfe@redhat.com>

kubernetes/enhancements,kubernetes/enhancements,kubernetes/enhancements