lint: ruff format + one auto-fix so the push self-test is green again

`scripts/lint.sh --fix` from the pinned lint devshell: 90 Python files
reformatted (ruff format, mechanical) and one C420 (dict comprehension →
dict.fromkeys) in tests/unit/test_f211_sso_skip.py. The push self-test had
been failing at the lint stage since build 1313 (2026-08-31) on exactly
these files; nothing else changed.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FqkQq3CDmFWcQ7u1LzoyRz

tests/n8n/custom/test_rest_settings.py

@@ -72,9 +72,9 @@ def test_rest_settings_returns_json_with_known_keys(live_app):
     # (e.g. version 3.2.0+2.20.6).
     assert isinstance(body, dict), f"/rest/settings returned non-dict JSON: {type(body).__name__}"
     data = body.get("data") if "data" in body else body
-    assert isinstance(
-        data, dict
-    ), f"/rest/settings response missing 'data' envelope: keys={list(body.keys())[:10]}"
+    assert isinstance(data, dict), (
+        f"/rest/settings response missing 'data' envelope: keys={list(body.keys())[:10]}"
+    )
     # Bootstrap keys the editor SPA relies on across versions:
     #   - `userManagement`: the auth-mode dict (whether owner-setup is needed, smtp/email mode).
     #   - `defaultLocale`: i18n bootstrap; present on every n8n install.