Drop Python 3.8, add Python 3.13, use PEP 639 SPDX license format - #287

@copilot Please, drop the Python 3.8 support instead, add Python 3.13 to the tests and omit the exceptions that disabled tests on Apple Silicon Mac and Python 3.12 (as suggested in #283).

@copilot Please, drop the Python 3.8 support instead, add Python 3.13 to the tests and omit the exceptions that disabled tests on Apple Silicon Mac and Python 3.12 (as suggested in #283).

Done in 159d14d. Changes made:

• Dropped Python 3.8 support (requires-python = ">=3.9")
• Added Python 3.13 to the CI test matrix
• Removed all exceptions for Apple Silicon Mac and Python 3.12
• Updated mecab-ko to >=1.0.2,<2.0.0
• Updated setuptools to >=77 for PEP 639 bare SPDX license format support

Hi @martinpopel - thanks for this work! Would it be possible to cut a release with these changes? Without it - I'd really love to be able to bump my package depending on sacrebleu to allow 3.12, but running into dependency issues with the old mecab-python and mecab-ko versions from the more recent release.

@arkadyark-cohere good point, thanks. Here you go: https://pypi.org/project/sacrebleu/2.6.0/.

@martinpopel thank you so much for the quick action and response! This worked for us now,, much appreciated!