add support for python 3.14

[pranabdas]

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[pranabdas]

astropy installation is failing in Windows with Python 3.14:

PEP517 build of a dependency failed

Backend subprocess exited when trying to invoke get_requires_for_build_wheel

    | Command '['C:\\Users\\RUNNER~1\\AppData\\Local\\Temp\\tmp_ln2rdej\\.venv\\Scripts\\python.exe', 'C:\\hostedtoolcache\\windows\\Python\\3.14.0-rc.2\\x64\\Lib\\site-packages\\pyproject_hooks\\_in_process\\_in_process.py', 'get_requires_for_build_wheel', 'C:\\Users\\RUNNER~1\\AppData\\Local\\Temp\\tmpgr6dq39l']' returned non-zero exit status 1.
    | 
    | Traceback (most recent call last):

    |   File "C:\hostedtoolcache\windows\Python\3.14.0-rc.2\x64\Lib\site-packages\pyproject_hooks\_in_process\_in_process.py", line 389, in <module>

    |     main()

    |     ~~~~^^

    |   File "C:\hostedtoolcache\windows\Python\3.14.0-rc.2\x64\Lib\site-packages\pyproject_hooks\_in_process\_in_process.py", line 373, in main

    |     json_out["return_val"] = hook(**hook_input["kwargs"])

    |                              ~~~~^^^^^^^^^^^^^^^^^^^^^^^^

    |   File "C:\hostedtoolcache\windows\Python\3.14.0-rc.2\x64\Lib\site-packages\pyproject_hooks\_in_process\_in_process.py", line 143, in get_requires_for_build_wheel

    |     return hook(config_settings)

    |   File "C:\Users\RUNNER~1\AppData\Local\Temp\tmp_ln2rdej\.venv\Lib\site-packages\setuptools\build_meta.py", line 331, in get_requires_for_build_wheel

    |     return self._get_build_requires(config_settings, requirements=[])

    |            ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    |   File "C:\Users\RUNNER~1\AppData\Local\Temp\tmp_ln2rdej\.venv\Lib\site-packages\setuptools\build_meta.py", line 301, in _get_build_requires

    |     self.run_setup()

    |     ~~~~~~~~~~~~~~^^

    |   File "C:\Users\RUNNER~1\AppData\Local\Temp\tmp_ln2rdej\.venv\Lib\site-packages\setuptools\build_meta.py", line 317, in run_setup

    |     exec(code, locals())

    |     ~~~~^^^^^^^^^^^^^^^^

    |   File "<string>", line 11, in <module>

    |   File "C:\Users\RUNNER~1\AppData\Local\Temp\tmp_ln2rdej\.venv\Lib\site-packages\extension_helpers\_setup_helpers.py", line 68, in get_extensions

    |     for setuppkg in iter_setup_packages(srcdir, packages):

    |                     ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^

    |   File "C:\Users\RUNNER~1\AppData\Local\Temp\tmp_ln2rdej\.venv\Lib\site-packages\extension_helpers\_setup_helpers.py", line 179, in iter_setup_packages

    |     module = import_file(setup_package, name=packagename + ".setup_package")

    |   File "C:\Users\RUNNER~1\AppData\Local\Temp\tmp_ln2rdej\.venv\Lib\site-packages\extension_helpers\_utils.py", line 147, in import_file

    |     loader.exec_module(mod)

    |     ~~~~~~~~~~~~~~~~~~^^^^^

    |   File "<frozen importlib._bootstrap_external>", line 762, in exec_module

    |   File "<frozen importlib._bootstrap>", line 491, in _call_with_frames_removed

    |   File "astropy\convolution\setup_package.py", line 9, in <module>

    |     C_CONVOLVE_PKGDIR = Path(__file__).parent.resolve().relative_to(Path.cwd())

    |   File "C:\hostedtoolcache\windows\Python\3.14.0-rc.2\x64\Lib\pathlib\__init__.py", line 495, in relative_to

    |     raise ValueError(f"{str(self)!r} is not in the subpath of {str(other)!r}")

    | ValueError: 'C:\\Users\\runneradmin\\AppData\\Local\\Temp\\tmp0iuckibd\\astropy-7.1.0\\astropy\\convolution' is not in the subpath of 'C:\\Users\\RUNNER~1\\AppData\\Local\\Temp\\tmp0iuckibd\\astropy-7.1.0'