Fix instability in test_topic_bw

Signed-off-by: Anthony Welte <[email protected]>

ros2topic/test/test_cli.py

@@ -874,7 +874,7 @@ def test_topic_bw(self):
             assert topic_command.wait_for_output(functools.partial(
                 launch_testing.tools.expect_output, expected_lines=[
                     'Subscribed to [/defaults]',
-                    re.compile(r'\d{2} B/s from \d+ messages'),
+                    re.compile(r'\d{2,3} B/s from \d+ messages'),
                     re.compile(r'\s*Message size mean: \d{2} B min: \d{2} B max: \d{2} B')
                 ], strict=True
             ), timeout=10)