test: skip bare worktree regression on old Git

The regression relies on git worktree, which was introduced in Git 2.5.1. Skip it on older installations, matching the neighboring worktree coverage.

Validation: focused regression passed; ruff check and ruff format --check passed.

Author: codex

test/test_repo.py

@@ -1461,6 +1461,9 @@ def test_git_work_tree_dotgit(self, rw_dir, use_relative_paths=False):
 
     @with_rw_directory
     def test_git_work_tree_from_bare_repo(self, rw_dir):
+        if Git().version_info[:3] < (2, 5, 1):
+            pytest.skip("worktree feature unsupported, needs git 2.5.1 or later")
+
         bare_repo = self.rorepo.clone(join_path_native(rw_dir, "bare_repo"), bare=True)
         worktree_path = join_path_native(rw_dir, "worktree_repo")
         bare_repo.git.worktree("add", "--detach", worktree_path)