Remove extra duration check in fastapi test (open-telemetry#2743)

Author: lzchen

instrumentation/opentelemetry-instrumentation-fastapi/tests/test_fastapi_instrumentation.py

@@ -768,7 +768,6 @@ def test_basic_metric_nonstandard_http_method_success_both_semconv(self):
             for point in list(metric.data.data_points):
                 if isinstance(point, HistogramDataPoint):
                     self.assertEqual(point.count, 1)
-                    self.assertAlmostEqual(duration, point.sum, delta=40)
                     if metric.name == "http.server.request.duration":
                         self.assertAlmostEqual(duration_s, point.sum, places=1)
                         self.assertDictEqual(