Vendor typing._allowed_types removed in Python 3.14

[hugovk]

Fix for Python 3.14 alpha, which removed the private/internal (underscored) typing._allowed_types: python/cpython#124090

Before:

❯ python3.14 -m pip install ghapi -q
❯ python3.14 -c "from ghapi.all import GhApi; print(GhApi)"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
    from ghapi.all import GhApi
  File "/Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/site-packages/ghapi/all.py", line 1, in <module>
    from .core import *
  File "/Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/site-packages/ghapi/core.py", line 9, in <module>
    from fastcore.all import *
  File "/private/tmp/fastcore/fastcore/all.py", line 3, in <module>
    from .dispatch import *
  File "/private/tmp/fastcore/fastcore/dispatch.py", line 174, in <module>
    @typedispatch
     ^^^^^^^^^^^^
  File "/private/tmp/fastcore/fastcore/dispatch.py", line 150, in __call__
    self.d[nm].add(f)
    ~~~~~~~~~~~~~~^^^
  File "/private/tmp/fastcore/fastcore/dispatch.py", line 93, in add
    else: a0,a1 = _p2_anno(f)
                  ~~~~~~~~^^^
  File "/private/tmp/fastcore/fastcore/dispatch.py", line 46, in _p2_anno
    hints = type_hints(f)
  File "/private/tmp/fastcore/fastcore/basics.py", line 355, in type_hints
    if not isinstance(f, typing._allowed_types): return {}
                         ^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/typing.py", line 3829, in __getattr__
    raise AttributeError(f"module {__name__!r} has no attribute {attr!r}")
AttributeError: module 'typing' has no attribute '_allowed_types'

After:

❯ python3.14 -c "from ghapi.all import GhApi; print(GhApi)"
<class 'ghapi.core.GhApi'>

[jph00]

Many thanks! This is an nbdev project, so the notebooks are the source - can you please update there?

[hugovk]

Updated, how does this look?

[jph00]

Great, thanks!