update comments about TypeForm since it has been deferred to python 3.15

[DetachHead]

see https://peps.python.org/pep-0747/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.37%. Comparing base (785c714) to head (c336b46).
⚠️ Report is 1 commits behind head on main.

@@           Coverage Diff           @@
##             main     #687   +/-   ##
=======================================
  Coverage   97.37%   97.37%           
=======================================
  Files           3        3           
  Lines        7687     7687           
=======================================
  Hits         7485     7485           
  Misses        202      202           

Flag	Coverage Δ
3.10	88.98% <ø> (ø)
3.10.4	88.98% <ø> (ø)
3.11	88.21% <ø> (ø)
3.11.0	87.44% <ø> (ø)
3.12	88.16% <ø> (ø)
3.12.0	88.14% <ø> (ø)
3.13	82.38% <ø> (ø)
3.13.0	82.38% <ø> (ø)
3.14	78.82% <ø> (ø)
3.9	89.69% <ø> (ø)
3.9.12	89.69% <ø> (ø)
pypy3.10	88.81% <ø> (ø)
pypy3.11	88.07% <ø> (ø)
pypy3.9	89.52% <ø> (ø)

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Files with missing lines	Coverage Δ
src/typing_extensions.py	93.88% <ø> (ø)

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