Bug in CFWriter with netcdf4>=1.60 because of changing behaviour of zlib encoding specification

[ghiggi]

Describe the bug

I just noticed that the new netcdf4 versions (>1.6.0) does not accept anymore the encoding "zlib": True, but expects the field "compression": "zlib" .

The CFWriter should likely be updated to deal with the netdf4 package version when defining the compression encoding.

Further info and relevant locations affected in the CFWriter:

• https://github.com/Unidata/netcdf4-python/blob/master/Changelog#L35
• https://github.com/pytroll/satpy/blob/main/satpy/writers/cf_writer.py#L74
• https://github.com/pytroll/satpy/blob/main/satpy/writers/cf_writer.py#L579
• https://github.com/pytroll/satpy/blob/main/satpy/writers/cf_writer.py#L867

FYI: @gerritholl @mraspaud

[ghiggi]

Need to wait for: pydata/xarray#6929 and pydata/xarray#6981