v0.8.7: Bump version to 0.8.7 for PyPI release (#22)
* Bump version to 0.8.7 for next PyPI release The v0.8.6 publish failed because pyproject.toml still had 0.8.5. * Upgrade GitHub Actions to Node.js 24 compatible versions actions/checkout v4 -> v6, actions/setup-python v5 -> v6