build(deps): bump github.com/rootless-containers/proto [Aleksa: Needed an update in oci/layer/utils.go because the upstream API broke as part of the fix for the go vet error.]
Bumps [github.com/rootless-containers/proto](https://github.com/rootless-containers/proto) from 0.1.0 to 0.1.2. - [Release notes](https://github.com/rootless-containers/proto/releases) - [Commits](https://github.com/rootless-containers/proto/compare/v0.1.0...v0.1.2)