Support building wheels for Python 3.14

[Nykakin]

Update cibuildwheel so that wheels for 3.14 are built as well. Resolves #77

After examining https://docs.python.org/3/howto/free-threading-extensions.html I've concluded that allowing running in Free Threading shouldn't be an issue for this extension.

Modified github worfklows to run tests on various platforms after compilation. The only omission is Free Threading for Windows, because one of test dependencies (orjson) fails to work; the library itself should be fine.

[Nykakin]

Tested with test.pypi.org, looks like it requires more work:

$ pip install -i https://test.pypi.org/simple/ chompjs 
Looking in indexes: https://test.pypi.org/simple/
Collecting chompjs
  Using cached chompjs-1.4.1.tar.gz (17 kB)
  Installing build dependencies ... error
  error: subprocess-exited-with-error
  
  × installing build dependencies for chompjs did not run successfully.
  │ exit code: 1
  ╰─> [3 lines of output]
      Looking in indexes: https://test.pypi.org/simple/
      ERROR: Could not find a version that satisfies the requirement setuptools>=40.8.0 (from versions: none)
      ERROR: No matching distribution found for setuptools>=40.8.0
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'chompjs' when installing build dependencies for chompjs