Add release note to `upgrade.rst`
Add release note to `upgrade.rst`

Signed-off-by: Đặng Minh Dũng <fb1be4839dc866bc8d8bd72754ff9bbbffdd905f@live.com>

cilium/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,tklauser/cilium,tklauser/cilium,cilium/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium