Metaclasses with type annotated attributes do not add `__annotations__ = {}` to derived classes.

Bug report

Bug description:

This can cause odd behaviour for subclasses which then propagate their parent's annotations rather than their own.

class MyType(type):
    METACLASS_VAR: int = 1

class A(metaclass=MyType):
    value: str = "HI"

class B(A):
    pass

B.__annotations__  # {"value": str} instead of {}; but if you remove the type annotation in `MyType`, you get {}

This issue only seems to affect versions prior to 3.14

CPython versions tested on:

3.10, 3.13, 3.14

Operating systems tested on:

Linux

先在 CPython 3.10 和 3.13 上运行已报告的 MyType、A 和 B 复现用例，并与 3.14 进行比较。跟踪元类上的类型注释属性如何影响派生类的 annotations。完成标准是：B 这样的子类获得自己的空注释字典，而不是继承 A 的注释，并且已在 Linux 上验证其行为。