Update internal/bzlmod/go_mod.bzl

Co-authored-by: Fabian Meumertzheim <fabian@meumertzhe.im>

internal/bzlmod/go_mod.bzl

@@ -124,7 +124,7 @@ def _relativize_replace_paths(go_mod, go_mod_path):
 
         if value.file_path:
             # drop the go.mod from the path, to get the directory
-            directory = go_mod_path.get_child("../")
+            directory = go_mod_path.dirname
 
             # now that we have the directory, we can use the use replace directive to get the full path
             file_path = str(directory.get_child(value.file_path))