Merge pull request #13 from techmo-pl/fix/grpcio-min-version-py39

fix: raise grpcio lower bound to >=1.80.0 (3.9+); pin tts-api to v3.2.2

chore: bump version to 3.2.9; update docker image reference

Update public release to v3.2.8 (#4)

* release v3.2.8

* ci: add workflow_dispatch trigger

* ci: add setuptools to proto stub venv for GitHub Actions

* chore: update tts-service-api submodule to v3.2.0 (adds OGG_OPUS, A_LAW, MU_LAW)

* ci: fix uv cache-dependency-glob to use pyproject.toml

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Co-authored-by: YASoftwareDev <[email protected]>