fix: bump the tolerance of cpu_average stats collected for test to a wider margin

Author: jason-famedly

tests/test_phone_home.py

@@ -63,7 +63,14 @@ def test_performance_100(self) -> None:
         self.get_success(
             phone_stats_home(self.hs, stats, past_stats)  # type: ignore[arg-type]
         )
-        self.assertApproximates(stats["cpu_average"], 100, tolerance=2.5)
+        # tolerance here started at 2.5. With Python 3.14 having a new measurement core
+        # the number tested here is an order of magnitude larger than previous Python
+        # versions. E.G.
+        # Python 3.13: 100.41760000000295
+        # Python 3.14: 103.63010000000088
+        # Bump this tolerance number into a safe margin. Side note: the numbers above
+        # were from a passing test, I can not reconcile this in the scope of 2.5
+        self.assertApproximates(stats["cpu_average"], 100, tolerance=4.5)
 
 
 class CommonMetricsTestCase(HomeserverTestCase):