Drop Python v3.8 support

Date when Python project won’t support v3.8

• Python 3.8 support has been dropped on October 7th of 2024 [1]
• Platform which still uses Py3.8

Todos

DuniterPy

• Create DuniterPy follow-up? Drop Python v3.8 support (duniterpy#199 - closed)

Silkaj

• Delete test job for v3.8 from .gitlab-ci.yml

• pyproject.toml: Bump minimum versions:

  • tools.poetry.dependency.python
  • tools.ruff.target-version
    • Fix types

• Create ticket for dropping Python 3.9 support: Merge with ticket about adding support for new the version? Since both are happening at the same time. Or, do we keep the two different things separated?

  • Add Python v3.14 and drop Python v3.9 support (#489)