fix: use 'repo' as prefix when constructing annotations label (#1033)

python/pip_install/tools/lock_file_generator/lock_file_generator.py

diff --git a/python/pip_install/tools/lock_file_generator/lock_file_generator.py b/python/pip_install/tools/lock_file_generator/lock_file_generator.py
index 4a64b3b..ed1488d 100644
--- a/python/pip_install/tools/lock_file_generator/lock_file_generator.py
+++ b/python/pip_install/tools/lock_file_generator/lock_file_generator.py
@@ -300,7 +300,7 @@
         annotated_requirements.update(
             {
                 name: "@{}//:{}.annotation.json".format(
-                    args.repo_prefix.rstrip("_"), name
+                    args.repo, name
                 )
             }
         )