Update CI away from the unsupported Python 3.8

[bact]

Description

3.8 is no longer a supported version for Python since 7 Oct 2024 https://devguide.python.org/versions/

Some CI workflows and dependencies may start to break. Need to upgrade it.

Expected results

Keep CI working

Current results

Steps to reproduce

PyThaiNLP version

Python version

3.8

Operating system and version

More info

No response

Possible solution

No response

Files

No response