Resolve SA1019 "github.com/containerd/containerd/pkg/seed" is deprecated lint warnings

[austinvazquez]

Resolve the following errors:

firecracker-control/cmd/containerd/main.go:76:2: SA1019: seed.WithTimeAndRand is deprecated: Do not rely on the global seed. (staticcheck)
        seed.WithTimeAndRand()
        ^
firecracker-control/cmd/containerd/main.go:21:2: SA1019: "github.com/containerd/containerd/pkg/seed" is deprecated: Do not rely on the global seed. (staticcheck)
        "github.com/containerd/containerd/pkg/seed"