Remove obsolete comment in Submodule.module

The local (i.e. late) import was removed in 7b3ef45, but the
comment about it on (what was) the preceding line has persisted
until now.

Author: EliahKagan

Diff for: git/objects/submodule/base.py

@@ -1217,7 +1217,6 @@ def module(self) -> "Repo":
         """:return: Repo instance initialized from the repository at our submodule path
         :raise InvalidGitRepositoryError: if a repository was not available. This could
             also mean that it was not yet initialized"""
-        # late import to workaround circular dependencies
         module_checkout_abspath = self.abspath
         try:
             repo = git.Repo(module_checkout_abspath)