Control: retitle -1 pandas: test-failing warning with new xarray

This is a warning being treated as an error, but the one in
test_to_xarray (probably due to the new version of xarray), not the
zoneinfo one. This is a FutureWarning, so it should be OK to *use* the
current pandas with the new xarray.

The same warning happens in autopkgtest but isn't treated as an error
there, so didn't block the new xarray.

I intend to try fixing this later.

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