fix(test): emit valid cross-platform TOML basic string escape sequences

Author: ReallocAll

tests/test_offline_builder.py

@@ -66,7 +66,7 @@ def test_cli_discovers_configured_repository(tmp_path: Path, monkeypatch: pytest
     assert tomllib.loads(plugin_config.read_text(encoding="utf-8"))["storage"]["path"] == "custom-backups"
     assert _default_repository() == tmp_path / "custom-backups" / "repo"
     plugin_config.write_text(
-        f'[storage]\\npath = {json.dumps(str(tmp_path / "absolute"))}\\n', encoding="utf-8"
+        f'[storage]\npath = {json.dumps(str(tmp_path / "absolute"))}\n', encoding="utf-8"
     )
     assert _default_repository() == tmp_path / "absolute" / "repo"
     assert build_parser().parse_args(["--repo", "manual/repo", "list"]).repo == Path("manual/repo")