Similar to how Helm and other CNCF projects do, we should have a concept of emeritus maintainer. An emeritus maintainer is a former maintainer of a repository that no longer remains active in the project. The person's GitHub handle should be mentioned in the projects' README.md file and not have any permission as maintainer or approver for the corresponding repository anymore.

This would also include adding previous Dapr maintainers that are not longer members of maintainer groups.