geopandas: Fix UnicodeEncodeError on Windows for geopandas.GeoDataFrame with non-ASCII characters

[seisman]

This PR adds a test for geopandas with non-ASCII characters, which doesn't work on Windows (https://github.com/GenericMappingTools/pygmt/actions/runs/19654941294/job/56289538628?pr=4224):

..\pygmt\tests\test_geopandas.py:289: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
..\pygmt\helpers\decorators.py:591: in new_module
    return module_func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
..\pygmt\src\info.py:100: in info
    with lib.virtualfile_in(check_kind="vector", data=data) as vintbl:
C:\Users\runneradmin\micromamba\envs\pygmt\Lib\contextlib.py:137: in __enter__
    return next(self.gen)
           ^^^^^^^^^^^^^^
..\pygmt\helpers\tempfile.py:157: in tempfile_from_geojson
    geojson.to_file(**ogrgmt_kwargs)
C:\Users\runneradmin\micromamba\envs\pygmt\Lib\site-packages\geopandas\geodataframe.py:1637: in to_file
    _to_file(self, filename, driver, schema, index, **kwargs)
C:\Users\runneradmin\micromamba\envs\pygmt\Lib\site-packages\geopandas\io\file.py:731: in _to_file
    _to_file_pyogrio(df, filename, driver, schema, crs, mode, metadata, **kwargs)
C:\Users\runneradmin\micromamba\envs\pygmt\Lib\site-packages\geopandas\io\file.py:793: in _to_file_pyogrio
    pyogrio.write_dataframe(df, filename, driver=driver, metadata=metadata, **kwargs)
C:\Users\runneradmin\micromamba\envs\pygmt\Lib\site-packages\pyogrio\geopandas.py:710: in write_dataframe
    write(
C:\Users\runneradmin\micromamba\envs\pygmt\Lib\site-packages\pyogrio\raw.py:723: in write
    ogr_write(
pyogrio\\_io.pyx:2585: in pyogrio._io.ogr_write
    ???
pyogrio\\_io.pyx:2575: in pyogrio._io.ogr_write
    ???
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <encodings.cp1252.Codec object at 0x00000273C9A3F110>, input = '\u0641\u064a\u062c\u064a'
errors = 'strict'

    def encode(self,input,errors='strict'):
>       return codecs.charmap_encode(input,errors,encoding_table)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E       UnicodeEncodeError: 'charmap' codec can't encode characters in position 0-3: character maps to <undefined>

This PR fixes the issue by setting encoding="UTF-8" when writing geopandas to ORG_GMT file.

[seisman]

@yvonnefroehlich This PR should fix the issue you had in GenericMappingTools/pygmt-paper-figures#6 (comment).

[weiji14]

Can confirm that this is Fiji in Arabic 😆