Use uv for actions

[mosquito]

This pull request updates the project's Python support, modernizes the CI workflow, and switches the build backend to use Hatchling. The most important changes are grouped below:

Python Version and Compatibility Updates:

• Dropped support for Python 3.9 and added support for Python 3.14 in both the pyproject.toml configuration and the GitHub Actions test matrix. Minimum required Python version is now 3.10.

Build System Modernization:

• Switched the build backend from setuptools to hatchling in pyproject.toml, updating the [build-system] section accordingly.

CI Workflow Improvements:

• Updated the GitHub Actions workflow to use actions/checkout@v4 and replaced actions/setup-python with astral-sh/setup-uv, leveraging uv for Python environment setup and dependency management.
• Changed installation and test commands to use uv, including running tests and Coveralls reporting within the uv environment.

Other:

• Bumped the package version from 0.2.9 to 0.2.10 in pyproject.toml.