coverage85-step2d: 新测试 lint 清理（删无用导入与变量）

deploy/tests/test_coverage85_deploy.py

@@ -8,7 +8,6 @@ import io
 import os
 import subprocess
 import sys
-import tarfile
 import tempfile
 import unittest
 from contextlib import redirect_stderr, redirect_stdout
@@ -341,7 +340,7 @@ class DeployMainTest(unittest.TestCase):
 
     def test_git_dry_run_via_main(self):
         with tempfile.TemporaryDirectory() as tmp:
-            head = _make_git_repo(tmp)
+            _make_git_repo(tmp)
             old_root = deploy_mod.REPO_ROOT
             deploy_mod.REPO_ROOT = tmp
             try: