Merge pull request #53 from giggsoff/oras-update

Update oras.land/oras-go and remove replaces

go.mod

@@ -3,20 +3,11 @@ module github.com/lf-edge/edge-containers
 go 1.15
 
 require (
-	github.com/containerd/containerd v1.6.18
-	github.com/gogo/googleapis v1.4.1 // indirect
-	github.com/google/uuid v1.3.0 // indirect
-	github.com/klauspost/compress v1.14.4 // indirect
-	github.com/moby/sys/mountinfo v0.6.0 // indirect
-	github.com/moby/sys/signal v0.7.0 // indirect
+	github.com/containerd/containerd v1.7.6
 	github.com/opencontainers/go-digest v1.0.0
-	github.com/opencontainers/image-spec v1.0.3-0.20211202183452-c5a74bcca799
-	github.com/sirupsen/logrus v1.8.1
-	github.com/spf13/cobra v1.2.1
-	github.com/stretchr/testify v1.7.0
-	oras.land/oras-go v1.1.0
+	github.com/opencontainers/image-spec v1.1.0-rc5
+	github.com/sirupsen/logrus v1.9.3
+	github.com/spf13/cobra v1.7.0
+	github.com/stretchr/testify v1.8.4
+	oras.land/oras-go v1.2.4
 )
-
-replace github.com/docker/docker => github.com/docker/docker v0.7.3-0.20190826074503-38ab9da00309
-
-replace golang.org/x/sys => golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c