Failing Firedrake test

The tests `_ test_from_fd_transfer[>-P^4-False-blob2d-order4-fdrake_mesh_pars4-2] _` is failing. It's currently marked as an `xfail` to keep the CI going.

The latest failed CI run is (March 2024)
https://github.com/inducer/meshmode/actions/runs/8147251267/job/22267538762
and the first failing CI run was 4 months ago (November 2023), but doesn't have a log anymore
https://github.com/inducer/meshmode/actions/runs/6918071993/job/18827031369

The issue seems to be a change in the convergence behavior that's making this assert fail:
```
File "/home/firedrake/meshmode/test/test_firedrake_interop.py", line 497, in test_from_fd_transfer
assert (
AssertionError: assert (3.6872206088592154 >= 4 or 8.64932389155193e-07 < 2e-14)
```