Move diff/windows to plugins/diff/windows

Signed-off-by: Derek McGowan <derek@mcg.dev>

cmd/containerd/builtins/builtins_windows.go

@@ -17,8 +17,8 @@
 package builtins
 
 import (
-	_ "github.com/containerd/containerd/v2/diff/windows"
 	_ "github.com/containerd/containerd/v2/plugins/diff/lcow"
+	_ "github.com/containerd/containerd/v2/plugins/diff/windows"
 	_ "github.com/containerd/containerd/v2/snapshots/lcow"
 	_ "github.com/containerd/containerd/v2/snapshots/windows"
 )

contrib/fuzz/builtins_windows.go

@@ -18,8 +18,8 @@ package fuzz
 
 import (
 	// Windows specific imports
-	_ "github.com/containerd/containerd/v2/diff/windows"
 	_ "github.com/containerd/containerd/v2/plugins/diff/lcow"
+	_ "github.com/containerd/containerd/v2/plugins/diff/windows"
 	_ "github.com/containerd/containerd/v2/snapshots/lcow"
 	_ "github.com/containerd/containerd/v2/snapshots/windows"
 )