build(deps): drop support for Python 3.8

[joanise]

PR Goal?

Python 3.8 is long EOL, and it prevents us from using uv lock on Windows. There is no value in keeping it anymore, so let's drop it.

Feedback sought?

confirmation we don't need Python 3.8 support anymore

Priority?

normal

Tests added?

all well covered

Confidence?

high

Version change?

no

Related PR

NRC-ILT/g2p#492

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
tests/test_g2p_cli.py	100% smaller
tests/test_make_xml_cli.py	100% smaller
.github/workflows/matrix-tests.yml	15% smaller
README.md	Unsupported file format
pyproject.toml	Unsupported file format
readalongs/__init__.py	0% smaller

[github-actions]

CLI load time: 0:00.04
Pull Request HEAD: c515851a30690a66965c6e79d7cc6abd2e57b301
No imports take more than 0.1 s.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.76%. Comparing base (19c9b25) to head (c515851).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #307   +/-   ##
=======================================
  Coverage   93.76%   93.76%           
=======================================
  Files          21       21           
  Lines        1765     1765           
  Branches      295      295           
=======================================
  Hits         1655     1655           
  Misses         73       73           
  Partials       37       37           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.