[helion][Benchmark] Increase the speedup threshold based on request (#7696)

Increase the sensitivity of helion speedup threshold

Author: yangw-dev

aws/lambda/benchmark_regression_summary_report/common/config.py

@@ -48,7 +48,7 @@
             "helion_speedup": RegressionPolicy(
                 name="helion_speedup",
                 condition="greater_equal",
-                threshold=0.85,
+                threshold=0.95,
                 baseline_aggregation="median",
             ),
         },