Failures on [ package:dds ] Add IPv6 support; 1.3.2 release

[zichangg]

There are new test failures on [ package:dds ] Add IPv6 support; 1.3.2 release.

The tests

pkg/dds/test/sse_smoke_test RuntimeError (expected Pass)

are failing on configurations

unittest-asserts-release-mac

Log: https://dart-ci.appspot.com/log/pkg-mac-release/unittest-asserts-release-mac/13725/pkg/dds/test/sse_smoke_test

[bkonyi]

Reverted in https://dart-review.googlesource.com/c/sdk/+/161450