Ignore dask-expr warning in CI

[jrbourbeau]

This warning is making most of our CI jobs fail. This PR ignores the warning like we're doing over in dask/dask

xref dask/dask#10917

[github-actions]

Unit Test Results

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

    27 files  ±     0      27 suites  ±0   10h 16m 41s ⏱️ + 9h 15m 14s
 3 965 tests +   479   3 854 ✅ +   599    109 💤  -   121  2 ❌ +2 
49 865 runs  +42 648  47 573 ✅ +41 337  2 290 💤 +1 331  2 ❌ +2 

For more details on these failures, see this check.

Results for commit dd916f1. ± Comparison against base commit 880da5d.

This pull request skips 1 and un-skips 133 tests.

distributed.protocol.tests.test_highlevelgraph

distributed.cli.tests.test_dask_worker ‑ test_dashboard_non_standard_ports
distributed.deploy.tests.test_local ‑ test_bokeh[False]
distributed.deploy.tests.test_local ‑ test_bokeh[True]
distributed.deploy.tests.test_local ‑ test_bokeh_kwargs
distributed.deploy.tests.test_local ‑ test_duplicate_clients
distributed.deploy.tests.test_local ‑ test_ipywidgets
distributed.deploy.tests.test_local ‑ test_ipywidgets_loop
distributed.deploy.tests.test_subprocess ‑ test_raise_on_windows
distributed.diagnostics.tests.test_eventstream ‑ test_eventstream
distributed.diagnostics.tests.test_memory_sampler ‑ test_pandas_multiseries[False]
…