Fix: Remove warning in GitHub file_status command test

Ensure that the opened test file is always closed in the test for the
GitHub file_status command function.

tests/github/test_cmds.py

@@ -51,9 +51,9 @@ async def test_file_status(self, api_mock):
             ],
         }
 
-        with temp_file(name="some.file") as test_file:
-            output = test_file.open("w", encoding="utf-8")
-
+        with temp_file(name="some.file") as test_file, test_file.open(
+            "w", encoding="utf8"
+        ) as output:
             args = Namespace(
                 repo="foo/bar",
                 pull_request=8,