Clean up deprecated async listener.stop()

[crusaderky]

Clean up deprecation from 2 years ago

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

    31 files  ± 0      31 suites  ±0   10h 49m 52s ⏱️ - 8m 20s
 4 123 tests  -  1   4 016 ✅  -  1    104 💤 ±0  3 ❌ ±0 
59 783 runs   - 15  57 305 ✅  - 16  2 474 💤 ±0  4 ❌ +1 

For more details on these failures, see this check.

Results for commit 24d3925. ± Comparison against base commit d9c0010.

This pull request removes 1 test.

distributed.tests.test_core ‑ test_async_listener_stop