deps: promote opencontainers/image-spec to a direct dependency.

Author: lemon07r

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/BurntSushi/toml v1.6.0
 	github.com/docker/docker v28.5.2+incompatible
 	github.com/fsnotify/fsnotify v1.9.0
+	github.com/opencontainers/image-spec v1.1.1
 	github.com/spf13/cobra v1.10.2
 	github.com/zeebo/blake3 v0.2.4
 )
@@ -29,7 +30,6 @@ require (
 	github.com/moby/term v0.5.2 // indirect
 	github.com/morikuni/aec v1.1.0 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
-	github.com/opencontainers/image-spec v1.1.1 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/spf13/pflag v1.0.9 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect