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
935607748,MDU6SXNzdWU5MzU2MDc3NDg=,5563,Decoding non-utf-8 encoded strings with the h5netcdf engine,11391714,closed,0,,,4,2021-07-02T09:49:58Z,2024-03-26T15:08:41Z,2024-03-26T15:08:41Z,NONE,,,,"**What happened**:
Trying to load a netCDF file-like (`io.BytesIO` object) with attribute strings in non-utf-8 encoding with the `h5netcdf` engine leads to `UnicodeDecodeError`.

**What you expected to happen**:
Loading the same file, albeit persisted to disk, with the `netcdf4` engine works fine, however, since the `netcdf4` engine doesnt support the file-like objects I ran into this issue. 

**Traceback**:
Traceback (most recent call last):
  File ""<stdin>"", line 1, in <module>
  File ""/home/thns/.venv/cmems/lib/python3.8/site-packages/xarray/backends/api.py"", line 242, in load_dataset
    with open_dataset(filename_or_obj, **kwargs) as ds:
  File ""/home/thns/.venv/cmems/lib/python3.8/site-packages/xarray/backends/api.py"", line 496, in open_dataset
    backend_ds = backend.open_dataset(
  File ""/home/thns/.venv/cmems/lib/python3.8/site-packages/xarray/backends/h5netcdf_.py"", line 384, in open_dataset
    ds = store_entrypoint.open_dataset(
  File ""/home/thns/.venv/cmems/lib/python3.8/site-packages/xarray/backends/store.py"", line 22, in open_dataset
    vars, attrs = store.load()
  File ""/home/thns/.venv/cmems/lib/python3.8/site-packages/xarray/backends/common.py"", line 126, in load
    attributes = FrozenDict(self.get_attrs())
  File ""/home/thns/.venv/cmems/lib/python3.8/site-packages/xarray/backends/h5netcdf_.py"", line 234, in get_attrs
    return FrozenDict(_read_attributes(self.ds))
  File ""/home/thns/.venv/cmems/lib/python3.8/site-packages/xarray/backends/h5netcdf_.py"", line 75, in _read_attributes
    v = maybe_decode_bytes(v)
  File ""/home/thns/.venv/cmems/lib/python3.8/site-packages/xarray/backends/h5netcdf_.py"", line 63, in maybe_decode_bytes
    return txt.decode(""utf-8"")

**Minimal Complete Verifiable Example**:

```python
import xarray as xr
import netCDF4

title = b'\xc3'

f = netCDF4.Dataset('test.nc', 'w')
f.title = title
f.close()
xr.load_dataset(""test.nc"", engine=""h5netcdf"")
```

**Environment**:

<details><summary>Output of <tt>xr.show_versions()</tt></summary>

<!-- Paste the output here xr.show_versions() here -->
INSTALLED VERSIONS
------------------
commit: None
python: 3.8.0 (default, Feb 25 2021, 22:10:10)
[GCC 8.4.0]
python-bits: 64
OS: Linux
OS-release: 4.15.0-136-generic
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: ('en_US', 'UTF-8')
libhdf5: 1.12.0
libnetcdf: 4.7.4

xarray: 0.18.1
pandas: 1.2.4
numpy: 1.20.3
scipy: None
netCDF4: 1.5.6
pydap: None
h5netcdf: 0.11.0
h5py: 3.2.1
Nio: None
zarr: None
cftime: 1.4.1
nc_time_axis: None
PseudoNetCDF: None
rasterio: None
cfgrib: None
iris: None
bottleneck: None
dask: None
distributed: None
matplotlib: None
cartopy: None
seaborn: None
numbagg: None
pint: None
setuptools: 57.0.0
pip: 21.1.3
conda: None
pytest: 6.2.4
IPython: 7.25.0
sphinx: None

</details>
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