fix(planning_data_analyzer): avoid GCC 13 false-positive stringop-overread in test

Use a named variable instead of an initializer list temporary when calling
set_evaluation_horizons() to prevent GCC 13 from emitting a spurious
-Wstringop-overread warning during deep inlining of vector operations.

Signed-off-by: Mete Fatih Cırıt <mfc@autoware.org>

Author: xmfcx

planning/autoware_planning_data_analyzer/test/test_open_loop_gt_source_mode.cpp

@@ -325,7 +325,8 @@ TEST_F(OpenLoopGTSourceModeTest, HeadingMetricsUseWrappedYawErrorPerHorizon)
   OpenLoopEvaluator evaluator(
     rclcpp::get_logger("open_loop_gt_source_test"), nullptr,
     OpenLoopEvaluator::GTSourceMode::GT_TRAJECTORY, 200.0);
-  evaluator.set_evaluation_horizons({0.2});
+  const std::vector<double> horizons = {0.2};
+  evaluator.set_evaluation_horizons(horizons);
 
   evaluator.evaluate(sync_data_list, nullptr);
   const auto metrics = evaluator.get_metrics();