style: ensure trailing commas in multi-line statements

tests/integration/cli/test_cli.py

@@ -21,10 +21,10 @@ def test_cli():
             sys.executable,
             '-m',
             'jcloud_docsgen',
-            '--help'
+            '--help',
         ],
         capture_output = True,
-        text = True
+        text = True,
     )
     stdout = result.stdout.lower()
     assert \