Update url for example h5netcdf ros3 dataset (#10713)

* update url

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

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

Author: TomNicholas

xarray/tests/test_backends.py

@@ -5174,9 +5174,7 @@ def test_write_inconsistent_chunks(self) -> None:
 @requires_h5netcdf_ros3
 class TestH5NetCDFDataRos3Driver(TestCommon):
     engine: T_NetcdfEngine = "h5netcdf"
-    test_remote_dataset: str = (
-        "https://www.unidata.ucar.edu/software/netcdf/examples/OMI-Aura_L2-example.nc"
-    )
+    test_remote_dataset: str = "https://archive.unidata.ucar.edu/software/netcdf/examples/OMI-Aura_L2-example.nc"
 
     @pytest.mark.filterwarnings("ignore:Duplicate dimension names")
     def test_get_variable_list(self) -> None: