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

[Copilot]

Updates Python version support and modernizes the project configuration.

Changes Made

• Python Support: Dropped Python 3.8, added Python 3.13 (requires-python = ">=3.9")
• License Format: Changed to PEP 639 bare SPDX format (license = "Apache-2.0")
• Build System: Updated setuptools requirement from >=64 to >=77 for PEP 639 support
• mecab-ko: Updated dependency to >=1.0.2,<2.0.0 (now supports Apple Silicon and Python 3.12+)
• CI Workflow:
  • Removed Python 3.8 from test matrix
  • Added Python 3.13 to test matrix
  • Removed exceptions for Apple Silicon Mac and Python 3.12 (no longer needed with mecab-ko 1.0.2+)

These changes align with the updates suggested in #283 and #284.

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[martinpopel]

@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]

@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

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• data.statmt.org
  • Triggering command: /usr/bin/python python -m pytest -x --ignore=test/test_mecab_ko.py (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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