XFAIL test_scheduler_bokeh.py::test_simple in Windows

[crusaderky]

This is extremely flaky in Windows CI.
The log shows the event loop stopping for 20+ seconds which makes me think it is an issue with the VM.

[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  +    1      31 suites  +1   11h 0m 19s ⏱️ + 31m 46s
 4 072 tests ±    0   3 965 ✅  -     1    104 💤 ±  0  3 ❌ +1 
59 101 runs  +2 628  56 666 ✅ +2 515  2 432 💤 +112  3 ❌ +1 

For more details on these failures, see this check.

Results for commit 192c3f6. ± Comparison against base commit 09ade3e.