Fixed a bug where file encoding was not specified.

[APLaS-Plus]

this is the error when I'm installing the repo:

(ovos-core) PS C:\Users\lzw20\Desktop\ovos-core> uv pip install .
error: The build backend returned an error
  Caused by: Call to `setuptools.build_meta:__legacy__.build_wheel` failed (exit code: 1)

[stderr]
Traceback (most recent call last):
  File "<string>", line 14, in <module>
  File "C:\Users\lzw20\AppData\Local\uv\cache\builds-v0\.tmpx2S5VA\Lib\site-packages\setuptools\build_meta.py", line 331, in get_requires_for_build_wheel    return self._get_build_requires(config_settings, requirements=[])
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\lzw20\AppData\Local\uv\cache\builds-v0\.tmpx2S5VA\Lib\site-packages\setuptools\build_meta.py", line 301, in _get_build_requires
    self.run_setup()
  File "C:\Users\lzw20\AppData\Local\uv\cache\builds-v0\.tmpx2S5VA\Lib\site-packages\setuptools\build_meta.py", line 512, in run_setup      
    super().run_setup(setup_script=setup_script)
  File "C:\Users\lzw20\AppData\Local\uv\cache\builds-v0\.tmpx2S5VA\Lib\site-packages\setuptools\build_meta.py", line 317, in run_setup      
    exec(code, locals())
  File "<string>", line 57, in <module>
UnicodeDecodeError: 'gbk' codec can't decode byte 0x8f in position 622: illegal multibyte sequence

hint: This usually indicates a problem with the package or the build environment.

I have updated the open() function in setup.py to use UTF-8 encoding, which resolves the decoding error.

old code with open(version_file) as f:
new code with open(version_file, encoding="utf-8") as f: