internal/pkg: rename inputs method

Inputs is more correct than dependencies in the current terminology.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pkg/file.go

@@ -63,8 +63,8 @@ func init() {
 	})
 }
 
-// Dependencies returns a nil slice.
-func (*fileArtifact) Dependencies() []Artifact { return nil }
+// Inputs returns a nil slice.
+func (*fileArtifact) Inputs() []Artifact { return nil }
 
 // IsExclusive returns false: Cure returns a prepopulated buffer.
 func (*fileArtifact) IsExclusive() bool { return false }