id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1215082284,I_kwDOAMm_X85IbK8s,6514,plugins.py:98: DeprecationWarning: SelectableGroups dict interface is deprecated. Use select.,226037,closed,0,,,4,2022-04-25T21:49:20Z,2022-04-27T01:07:50Z,2022-04-27T01:07:50Z,MEMBER,,,,"### What happened?

The plugin interface warns with `DeprecationWarning` in python 3.10.

### What did you expect to happen?

No warning to be issued.

### Minimal Complete Verifiable Example

```Python
Running `pytest` on any *Xarray* importing test.
```


### Relevant log output

```Python
   .../python3.10/site-packages/xarray/backends/plugins.py:98: DeprecationWarning: SelectableGroups dict interface is deprecated. Use select.
    entrypoints = entry_points().get(""xarray.backends"", ())
```

### Anything else we need to know?

According to the *Compatibity note* in:

https://docs.python.org/3/library/importlib.metadata.html#entry-points

the new API is `entry_points(group='xarray.backends')`

### Environment

<details>
INSTALLED VERSIONS
------------------
commit: None
python: 3.10.4 | packaged by conda-forge | (main, Mar 24 2022, 17:42:03) [Clang 12.0.1 ]
python-bits: 64
OS: Darwin
OS-release: 21.3.0
machine: arm64
processor: arm
byteorder: little
LC_ALL: None
LANG: None
LOCALE: (None, 'UTF-8')
libhdf5: None
libnetcdf: None

xarray: 2022.3.0
pandas: 1.4.2
numpy: 1.22.3
scipy: 1.8.0
netCDF4: None
pydap: None
h5netcdf: None
h5py: None
Nio: None
zarr: 2.11.3
cftime: None
nc_time_axis: None
PseudoNetCDF: None
rasterio: 1.2.10
cfgrib: None
iris: None
bottleneck: None
dask: 2022.04.1
distributed: 2022.4.1
matplotlib: 3.5.1
cartopy: None
seaborn: None
numbagg: None
fsspec: 2022.3.0
cupy: None
pint: None
sparse: None
setuptools: 62.1.0
pip: 22.0.4
conda: 4.12.0
pytest: 7.1.2
IPython: 8.2.0
sphinx: None
</details>
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