Update mypy-dev to 1.14.0a2

[cdce8p]

Proposed change

https://github.com/cdce8p/mypy-dev/releases/tag/1.14.0a2
Compare: python/mypy@946c1bf...05a9e79

• Typeshed updates
• Minor speed improvements
• Initial support for new syntax TypeVar defaults (requires 3.13)
  Add initial support for new style TypeVar defaults (PEP 696) python/mypy#17985
• Improve for loop index variable type narrowing.
  Resolves some false-positives when accessing TypedDicts with loop index vars.
  Improve for loop index variable type narrowing python/mypy#18014

class X(TypedDict):
    hourly: int
    daily: int

def func(x: X) -> None:
    for var in ("hourly", "daily"):
        print(x[var])

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