`--warn-return-any` not applied to generics

Bug Report

When a function annotated to return tuple[T] returns tuple[Any] no error is raised. Same with list.

To Reproduce

from __future__ import annotations
from typing import Any

def passes() -> tuple[str]:
    a: Any
    return (a,)

def fails_1() -> tuple[str]:
    a: int
    return (a,)
    # error: Incompatible return value type (got "Tuple[int]", expected "Tuple[str]")

def fails_2() -> str:
    a: Any
    return a
    # error: Returning Any from function declared to return "str"

Expected Behavior

I'd expect passes() to fail with error: Returning Tuple[Any] from function declared to return "Tuple[str]" when using mypy with --strict

Actual Behavior

Tuple[Any] is inferred to Tuple[str]

Your Environment

• Mypy version used: 0.812
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files):

# setup.cfg
[mypy]
python_version = 3.8
strict = true
warn_unreachable = true
implicit_reexport = true
ignore_missing_imports = true

• Python version used: 3.9.1
• Operating system and version: macOS 10.13.6

Comienza con el reproductor de Python proporcionado, que contiene retornos de tipo tuple[str], tuple[Any], list y Any, y ejecútalo con la configuración estricta indicada. Traza cómo se infieren y comprueban los tipos de retorno genéricos; después, añade cobertura para el caso de tupla y confirma que se produce el diagnóstico esperado Returning Tuple[Any].