stale-bot: stale PRs with assignees
stale-bot: stale PRs with assignees

With the introduction of assignees to review PRs, as a consequence the
stale bot will never stale such PRs. To change this behavior we can
modify the configuration for the stale bot to also stale PRs that have
assignees.

Signed-off-by: André Martins <bc9800b9d52a24cce72a73dd528afed53f10e5fc@cilium.io>

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