feature: support Python 3.14 free-threaded mode

[yilei]

Did you check the tree-sitter docs?

• I have read all the tree-sitter docs if it relates to using the parser

Is your feature request related to a problem? Please describe.

Python 3.14 free-threaded mode is now officially supported, but https://pypi.org/project/tree-sitter-rust doesn't provide Python 3.14 free-threaded wheels yet, nor it could be built from source.

Describe the solution you'd like

Make it package build with Python 3.14 free-threaded mode, and publish prebuilt wheels.

Describe alternatives you've considered

N/A

Additional context

No response