Fix wrong unit in Flask new semconv test (#2645)

Author: emdneto

instrumentation/opentelemetry-instrumentation-flask/tests/test_programmatic.py

@@ -497,7 +497,7 @@ def test_flask_metrics_new_semconv(self):
         self.client.get("/hello/123")
         self.client.get("/hello/321")
         self.client.get("/hello/756")
-        duration = max(round((default_timer() - start) * 1000), 0)
+        duration_s = max(default_timer() - start, 0)
         metrics_list = self.memory_metrics_reader.get_metrics_data()
         number_data_point_seen = False
         histogram_data_point_seen = False
@@ -514,7 +514,7 @@ def test_flask_metrics_new_semconv(self):
                         if isinstance(point, HistogramDataPoint):
                             self.assertEqual(point.count, 3)
                             self.assertAlmostEqual(
-                                duration, point.sum, delta=10
+                                duration_s, point.sum, places=2
                             )
                             histogram_data_point_seen = True
                         if isinstance(point, NumberDataPoint):