Upgrade Starboard to v0.15.4

Upgrade Starboard to the latest version.

This also causes several other dependencies to be upgraded, including protobuf.

$ go get github.com/aquasecurity/starboard@v0.15.4
go: upgraded github.com/Microsoft/go-winio v0.5.0 => v0.5.1
go: upgraded github.com/aquasecurity/starboard v0.12.0 => v0.15.4
go: upgraded github.com/go-logr/logr v1.2.0 => v1.2.3
go: upgraded github.com/google/go-containerregistry v0.6.0 => v0.8.0
go: upgraded github.com/klauspost/compress v1.13.0 => v1.13.6
go: upgraded github.com/spf13/cobra v1.3.0 => v1.4.0
go: upgraded github.com/stretchr/testify v1.7.0 => v1.7.1
go: upgraded golang.org/x/net v0.0.0-20211209124913-491a49abca63 => v0.0.0-20220225172249-27dd8689420f
go: upgraded golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b => v0.0.0-20210927222741-03fcf44c2211
go: upgraded google.golang.org/protobuf v1.27.1 => v1.28.0
go: upgraded k8s.io/api v0.23.3 => v0.23.5
go: upgraded k8s.io/apiextensions-apiserver v0.23.0 => v0.23.5
go: upgraded k8s.io/apimachinery v0.23.3 => v0.23.5
go: upgraded k8s.io/cli-runtime v0.23.3 => v0.23.5
go: upgraded k8s.io/client-go v0.23.3 => v0.23.5
go: upgraded k8s.io/component-base v0.23.3 => v0.23.5
go: upgraded k8s.io/klog/v2 v2.30.0 => v2.60.1
go: upgraded sigs.k8s.io/controller-runtime v0.11.0 => v0.11.2