stdlib: rename dagger.io/llb to dagger.io/dagger/op

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

stdlib/dagger/dagger.cue

@@ -1,13 +1,13 @@
 package dagger
 
 import (
-	"dagger.io/llb"
+	"dagger.io/dagger/op"
 )
 
 // An artifact such as source code checkout, container image, binary archive...
 // May be passed as user input, or computed by a buildkit pipeline
 #Artifact: {
-	#up: [...llb.#Op]
+	#up: [...op.#Op]
 	_
 	...
 }