xfail test which times out due to large nisar file (#370)

* xfail test which times out

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: TomNicholas

virtualizarr/tests/test_backend.py

@@ -284,6 +284,7 @@ def test_read_from_url(self, hdf_backend, filetype, url):
             vds = open_virtual_dataset(url, indexes={})
             assert isinstance(vds, xr.Dataset)
 
+    @pytest.mark.xfail(reason="often times out, as nisar file is 200MB")
     def test_virtualizarr_vs_local_nisar(self, hdf_backend):
         import fsspec