refactor: Remove unused template substitution (#2004)

Removing a minor nit. The variable seems unused.

python/private/pypi/hub_repository.bzl

diff --git a/python/private/pypi/hub_repository.bzl b/python/private/pypi/hub_repository.bzl
index 5e209d6..40a3ab1 100644
--- a/python/private/pypi/hub_repository.bzl
+++ b/python/private/pypi/hub_repository.bzl
@@ -63,7 +63,6 @@
             for p in bzl_packages
         }),
         "%%MACRO_TMPL%%": macro_tmpl,
-        "%%NAME%%": rctx.attr.repo_name,
     })
 
 hub_repository = repository_rule(