`ClassVar` cannot be overridden with `Final`

Bug Report

A typing.ClassVar cannot be overridden with typing.Final.

main.py:7: error: Cannot override class variable (previously declared on base class "Base") with instance variable  [misc]
Found 1 error in 1 file (checked 1 source file)

To Reproduce

import typing

class Base:
    value : typing.ClassVar[str]
    
class Derived(Base):
    value : typing.Final[str] = 'derived'

https://mypy-play.net/?mypy=latest&python=3.12&flags=verbose&gist=03819c6e8c7b6fb53baebe094faed123

Expected Behavior

I though using a typing.Final annotation would imply typing.ClassVar.

Actual Behavior

It seems not allowed to override a ClassVar with a Final.

Your Environment

See reproducer.

从提供的 Python reproducer 开始，跟踪 mypy 如何处理使用 Final 注解覆盖 ClassVar。确认预期的类型检查行为，并为此情况添加覆盖；完成的标准是 reproducer 不再报告错误的覆盖错误，且现有检查仍然通过。